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NCEA L3 Psychology study materials
NCEA L3 Psychology study resources

NCEA L3 Psychology practice questions

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Question 1Psychological inquiry and research methods

A psychology student wants to investigate whether background music affects concentration. Which statement best describes the purpose of a hypothesis in this investigation?

  1. A testable prediction about the relationship between background music and concentration Correct answer.
  2. A detailed description of the procedure used to play the music
  3. A random selection of participants from a school population
  4. A summary of the results collected after the experiment is completed

Explanation

A hypothesis is a specific, testable prediction about the relationship between variables, made before data are collected. It guides the design and analysis rather than describing results or procedures.

Question 2Psychological inquiry and research methods

In an experiment on sleep deprivation and reaction time, the sleep condition is manipulated by the researcher. What is the manipulated variable called?

  1. The confounding variable
  2. The control variable
  3. The independent variable Correct answer.
  4. The dependent variable

Explanation

The independent variable is the factor the researcher deliberately manipulates to observe its effect. Reaction time would be the dependent variable measured in response.

Question 3Psychological inquiry and research methods

A researcher measures participants' scores twice on the same test and finds the two sets of scores are highly consistent. Which property of the test does this demonstrate?

  1. Validity
  2. Reliability Correct answer.
  3. Generalisation
  4. Objectivity

Explanation

Reliability refers to the consistency and stability of a measure across repeated administrations. A test can be reliable without necessarily measuring what it claims to measure.

Question 4Psychological inquiry and research methods

Which sampling method gives every member of a defined population an equal chance of being selected?

  1. Random sampling Correct answer.
  2. Snowball sampling
  3. Purposive sampling
  4. Opportunity sampling

Explanation

Random sampling means every member of the population has an equal probability of selection, which reduces selection bias. Other methods rely on availability, referral, or researcher judgement.

Question 5Psychological inquiry and research methods

A researcher explains the study to participants, obtains their agreement, and tells them they may withdraw at any time. Which ethical principle is being applied?

  1. Confidentiality
  2. Debriefing
  3. Deception
  4. Informed consent Correct answer.

Explanation

Informed consent requires that participants understand the purpose and procedures and agree voluntarily, including the right to withdraw. Confidentiality and debriefing are separate ethical requirements.

Question 6Psychological inquiry and research methods

Which measure of central tendency is most affected by a single extreme outlier in a data set?

  1. The mean Correct answer.
  2. The median
  3. The range
  4. The mode

Explanation

The mean uses every value in its calculation, so one extreme score pulls it strongly. The median and mode are resistant to outliers, and the range is a measure of spread rather than central tendency.

Question 7Psychological inquiry and research methods

A study finds that students who eat breakfast report higher test scores. Which conclusion is most justified from this correlational finding?

  1. Eating breakfast causes higher test scores
  2. There is an association between breakfast and test scores Correct answer.
  3. Skipping breakfast is the main cause of low scores
  4. Test scores determine whether students eat breakfast

Explanation

Correlational designs show that two variables are associated but cannot establish which causes which or rule out third variables. Causal claims require controlled experimental manipulation.

Question 8Psychological inquiry and research methods

In a psychology report, in which section would the researcher describe the participants, materials, and procedure?

  1. The method Correct answer.
  2. The results
  3. The discussion
  4. The introduction

Explanation

The method section documents how the study was conducted, including participants, materials, and procedure so others could replicate it. Results report data and discussion interprets findings.

Question 9Psychological inquiry and research methods

A researcher wants to compare problem-solving speed between two independent groups of participants. Which statistical test is appropriate for comparing the means of two unrelated groups?

  1. A chi-square test of independence
  2. A paired-samples t-test
  3. A Pearson correlation coefficient
  4. An independent-samples t-test Correct answer.

Explanation

An independent-samples t-test compares means from two separate groups of participants. A paired test is for related or repeated measures, while chi-square and correlation address different questions.

Question 10Psychological inquiry and research methods

A researcher tells participants the study is about 'memory' but actually measures obedience to an authority figure. Which ethical issue is most directly raised?

  1. Poor reliability
  2. Insufficient sample size
  3. Lack of confidentiality
  4. Deception Correct answer.

Explanation

Deliberately misleading participants about the true purpose of a study constitutes deception, which must be justified and followed by thorough debriefing. Reliability and sample size are methodological rather than ethical concerns here.

Question 11Psychological inquiry and research methods

A researcher tests the same participants under two conditions and compares their scores. Which design is being used?

  1. Cross-sectional design
  2. Independent measures design
  3. Matched pairs design
  4. Repeated measures design Correct answer.

Explanation

In a repeated measures design the same participants experience all conditions, controlling individual differences but risking order effects. Independent and matched pairs designs use different participants across conditions.

Question 12Psychological inquiry and research methods

To reduce order effects in a repeated measures experiment, a researcher has half the participants complete condition A then B, and the other half complete B then A. What is this technique called?

  1. Standardisation
  2. Random allocation
  3. Blinding
  4. Counterbalancing Correct answer.

Explanation

Counterbalancing varies the order of conditions across participants so that practice or fatigue effects are spread evenly. Random allocation assigns participants to groups but does not address order.

Question 13Psychological inquiry and research methods

A researcher uses a questionnaire with questions that lead participants toward a particular answer. Which type of validity is most threatened?

  1. Inter-rater reliability
  2. Internal reliability
  3. Ecological validity
  4. Construct validity Correct answer.

Explanation

Leading questions bias responses so the instrument no longer accurately measures the intended construct, threatening construct validity. Reliability concerns consistency, and ecological validity concerns realism of the setting.

Question 14Psychological inquiry and research methods

A researcher wants a sample that reflects the proportions of year levels in a school population. Which method is most appropriate?

  1. Stratified sampling Correct answer.
  2. Volunteer sampling
  3. Opportunity sampling
  4. Snowball sampling

Explanation

Stratified sampling divides the population into subgroups and samples each in proportion, ensuring representation of year levels. The other methods do not deliberately preserve population proportions.

Question 15Psychological inquiry and research methods

A researcher reports a p-value of 0.03 for a difference between groups. What does this conventionally indicate?

  1. The effect size is large
  2. The null hypothesis has been proven true
  3. The result is statistically significant at the 0.05 level Correct answer.
  4. The result has no practical importance

Explanation

A p-value below the conventional 0.05 threshold is treated as statistically significant, meaning the observed result is unlikely under the null hypothesis. It says nothing directly about effect size or practical importance.

Question 16Psychological inquiry and research methods

A researcher finds a correlation coefficient of -0.82 between hours of sleep and reported stress. How should this be interpreted?

  1. No relationship between the two variables
  2. A strong positive relationship: more sleep is associated with higher stress
  3. A strong negative relationship: more sleep is associated with lower stress Correct answer.
  4. A weak negative relationship with little practical meaning

Explanation

A coefficient of -0.82 is close to -1, indicating a strong negative association: as one variable increases, the other tends to decrease. The sign shows direction and the magnitude shows strength.

Question 17Psychological inquiry and research methods

A researcher studies aggression by observing children in a playground and recording specific predefined behaviours. Which method is being used?

  1. A case study
  2. An unstructured interview
  3. A structured observation Correct answer.
  4. A naturalistic experiment

Explanation

A structured observation uses predefined behavioural categories recorded systematically in a setting. Interviews and case studies gather different forms of data, and a naturalistic experiment requires manipulation of a variable.

Question 18Psychological inquiry and research methods

A researcher uses a double-blind procedure in a drug trial. What does this control for?

  1. Poor reliability of the dependent variable
  2. Order effects from repeated testing
  3. Sampling bias from volunteer participants
  4. Demand characteristics and experimenter bias Correct answer.

Explanation

Double-blind procedures conceal condition assignment from both participants and researchers, reducing demand characteristics and experimenter expectancy effects. Order effects and sampling bias require different controls.

Question 19Psychological inquiry and research methods

A researcher wants to generalise findings from a small sample of university students to the wider adult population. Which issue is most relevant?

  1. Internal reliability
  2. Inter-rater reliability
  3. External validity Correct answer.
  4. Demand characteristics

Explanation

External validity concerns whether findings can be generalised beyond the sample and setting studied. A narrow student sample may limit generalisation to the wider adult population.

Question 20Psychological inquiry and research methods

A researcher calculates a 95% confidence interval for a mean difference that ranges from 0.5 to 4.2. Which interpretation is most appropriate?

  1. The true population difference is likely positive, since the interval excludes zero Correct answer.
  2. The sample mean difference is definitely 4.2
  3. The result is not statistically significant because the interval is wide
  4. There is a 95% chance the sample mean equals the population mean

Explanation

A confidence interval that does not include zero suggests the population difference is likely non-zero, consistent with statistical significance. The interval describes plausible population values, not a guarantee about the sample mean.

Question 21Psychological inquiry and research methods

A researcher claims that because a study had high internal validity, its findings will apply to everyday classroom settings. Which criticism is most appropriate?

  1. High internal validity does not ensure high ecological validity Correct answer.
  2. Internal validity is irrelevant to experimental research
  3. Ecological validity is the same construct as internal validity
  4. High internal validity guarantees high external validity

Explanation

Internal validity concerns whether the design supports causal conclusions, while ecological validity concerns whether findings transfer to real-world settings. A tightly controlled study can be internally valid yet artificial.

Question 22Psychological inquiry and research methods

A study reports an effect with a very small p-value but a very small effect size. What is the most defensible interpretation?

  1. The small effect size proves the result is due to chance
  2. The difference is both statistically and practically important
  3. The difference is statistically detectable but may have limited practical importance Correct answer.
  4. The p-value is invalid because the effect size is small

Explanation

Statistical significance indicates that an effect is unlikely to be due to chance, but effect size indicates its magnitude. With large samples, trivial effects can reach significance, so practical importance needs separate judgement.

Question 23Psychological inquiry and research methods

A researcher uses self-report questionnaires to measure anxiety and finds scores correlate with a physiological stress measure. Which form of validity does this support?

  1. Test-retest reliability
  2. Internal consistency
  3. Inter-rater reliability
  4. Concurrent validity Correct answer.

Explanation

Concurrent validity is supported when a new measure correlates with an established or independent measure of the same construct. Reliability forms concern consistency rather than agreement with another measure.

Question 24Psychological inquiry and research methods

A researcher finds a significant interaction between gender and teaching method on test performance. What does an interaction indicate?

  1. Gender causes performance differences regardless of teaching method
  2. Teaching method has no effect on performance for either gender
  3. Both gender and teaching method independently affect performance but do not combine
  4. The effect of teaching method on performance differs depending on gender Correct answer.

Explanation

An interaction means the effect of one independent variable on the dependent variable changes across levels of another variable. Main effects describe overall effects, while an interaction describes their combined pattern.

Question 25Psychological inquiry and research methods

A researcher wants to reduce demand characteristics in a study on helping behaviour. Which approach is most appropriate?

  1. Use a cover story and avoid revealing the true aim to participants Correct answer.
  2. Use a repeated measures design
  3. Calculate a correlation coefficient instead of a t-test
  4. Increase the sample size substantially

Explanation

Demand characteristics arise when participants infer the aim and alter their behaviour, so concealing the true purpose with an appropriate cover story (followed by debriefing) reduces them. Sample size and analysis choices do not address this source of bias.

Question 26Psychological inquiry and research methods

In psychological research, what does the term 'operationalisation' refer to when defining a variable?

  1. Specifying precisely how a variable will be measured or manipulated in the study Correct answer.
  2. Reviewing the ethical guidelines that apply to the study
  3. Writing the abstract summarising the study's findings
  4. Selecting the statistical test used to analyse the data

Explanation

Operationalisation is the process of turning an abstract construct such as 'aggression' or 'stress' into concrete, measurable indicators so that other researchers could replicate the procedure. It defines what will be observed or recorded, not the ethics, statistics, or reporting of the study.

Question 27Psychological inquiry and research methods

A psychology student wants to investigate whether caffeine affects reaction time. Which statement is the best operationalisation of the dependent variable?

  1. The amount of caffeine consumed before testing
  2. The participants' general level of tiredness
  3. How alert participants feel during the experiment
  4. Reaction time measured in milliseconds on a computer-based visual detection task Correct answer.

Explanation

An operationalised dependent variable must specify the exact measurement procedure and unit, such as milliseconds on a defined computer task. The other options either describe the independent variable or use subjective, unmeasured impressions.

Question 28Psychological inquiry and research methods

Which statement best describes the purpose of a null hypothesis in psychological research?

  1. It states the researcher's expected direction of the effect before data collection
  2. It predicts that there will be no effect or no relationship between the variables being studied Correct answer.
  3. It describes the ethical safeguards applied to participants
  4. It summarises the descriptive statistics obtained from the sample

Explanation

The null hypothesis is a statement of no effect or no relationship and provides the baseline that inferential statistics test against. A directional prediction belongs to the alternative hypothesis, while descriptive statistics and ethics are unrelated to the null hypothesis.

Question 29Psychological inquiry and research methods

A researcher predicts that participants who sleep more than eight hours will recall more words than those who sleep less than six hours. Which type of hypothesis is this?

  1. A non-directional (two-tailed) null hypothesis
  2. A descriptive hypothesis about sample means
  3. A non-directional alternative hypothesis
  4. A directional (one-tailed) alternative hypothesis Correct answer.

Explanation

Because the researcher specifies the expected direction of the difference (more sleep predicts more recall), it is a directional alternative hypothesis. A non-directional hypothesis would simply state that a difference exists without predicting its direction.

Question 30Psychological inquiry and research methods

In a study, the researcher's expectation that participants will behave aggressively could unconsciously influence how behaviour is recorded. Which concept does this describe?

  1. Experimenter bias Correct answer.
  2. Demand characteristics
  3. Sampling bias
  4. Participant reactivity

Explanation

Experimenter bias occurs when the researcher's expectations influence the recording or interpretation of data. Sampling bias concerns who is selected, reactivity concerns participants changing because they are observed, and demand characteristics concern cues that suggest expected behaviour to participants.

Question 31Psychological inquiry and research methods

A researcher studying classroom behaviour sits at the back of the room for two weeks before beginning formal observations. What is the main purpose of this period?

  1. To randomly assign students to experimental conditions
  2. To allow participants to habituate so that reactivity is reduced Correct answer.
  3. To increase the sample size before data collection begins
  4. To check inter-rater reliability between observers

Explanation

A habituation period lets participants adjust to the observer's presence so that their behaviour becomes more natural, reducing reactivity. It does not change sample size, assign conditions, or assess agreement between raters.

Question 32Psychological inquiry and research methods

Which of the following is the strongest example of a quantitative research method in psychology?

  1. Scoring participants' scores on a standardised anxiety inventory Correct answer.
  2. Conducting an unstructured interview about a participant's childhood
  3. Recording detailed field notes about a participant's behaviour
  4. Analysing themes in participants' diary entries

Explanation

Quantitative methods produce numerical data that can be statistically analysed, such as scores on a standardised inventory. Field notes, unstructured interviews, and thematic analysis of diaries generate qualitative data.

Question 33Psychological inquiry and research methods

A researcher wants to study the lived experience of first-year university students adjusting to hostel life. Which method is most appropriate?

  1. A naturalistic observation recording predefined behaviour counts
  2. A laboratory experiment manipulating hostel conditions
  3. Semi-structured interviews analysed thematically Correct answer.
  4. A correlational study using standardised test scores

Explanation

Exploring lived experience calls for rich, detailed accounts, which semi-structured interviews analysed thematically provide. Experiments, correlations, and predefined behaviour counts do not capture subjective meaning in depth.

Question 34Psychological inquiry and research methods

Which of the following best describes a strength of using a case study design in psychology?

  1. It allows in-depth investigation of rare or complex phenomena that cannot be studied experimentally Correct answer.
  2. It guarantees that findings will generalise to the wider population
  3. It eliminates the influence of researcher subjectivity
  4. It allows precise control of extraneous variables

Explanation

Case studies provide rich, detailed data about unusual or complex cases that would be unethical or impractical to manipulate experimentally. Their weakness is limited generalisability, and they do not remove subjectivity or provide strong control.

Question 35Psychological inquiry and research methods

A researcher wants to check whether two observers record the same behaviour in the same way. Which procedure should be used?

  1. Randomly assign participants to conditions
  2. Use a double-blind procedure
  3. Increase the number of participants observed
  4. Calculate inter-observer reliability by comparing their independent records Correct answer.

Explanation

Inter-observer reliability is assessed by having observers record independently and then comparing their records for consistency. Adding participants, random assignment, and blinding address different design issues, not agreement between observers.

Question 36Psychological inquiry and research methods

A test is administered to the same participants twice, two weeks apart, and the two sets of scores are strongly correlated. Which type of reliability does this demonstrate?

  1. Content validity
  2. Internal consistency
  3. Test-retest reliability Correct answer.
  4. Inter-observer reliability

Explanation

Test-retest reliability is established by administering the same measure on two occasions and correlating the scores; a strong correlation indicates stability over time. Inter-observer reliability compares different raters, internal consistency compares items within one administration, and content validity concerns coverage of the construct.

Question 37Psychological inquiry and research methods

A researcher finds that a new stress questionnaire correlates highly with an established, well-validated stress measure. Which type of validity does this provide evidence for?

  1. Face validity
  2. Inter-observer reliability
  3. Test-retest reliability
  4. Concurrent validity Correct answer.

Explanation

Concurrent validity is demonstrated when a new measure correlates with an existing validated measure of the same construct administered at roughly the same time. Face validity is a superficial judgement, and the other options concern reliability rather than validity.

Question 38Psychological inquiry and research methods

What is the key distinction between reliability and validity in psychological measurement?

  1. Reliability concerns consistency of measurement, while validity concerns whether the measure assesses the intended construct Correct answer.
  2. Reliability concerns whether the construct is measured, while validity concerns consistency across occasions
  3. Reliability applies only to qualitative data, while validity applies only to quantitative data
  4. Reliability concerns ethical approval, while validity concerns statistical significance

Explanation

Reliability is about consistency and reproducibility of a measure, whereas validity is about accuracy in measuring the intended construct. A measure can be reliable without being valid, so the two concepts must be distinguished.

Question 39Psychological inquiry and research methods

A researcher selects every tenth name from an alphabetical list of the school roll to form a sample. Which sampling method is this?

  1. Snowball sampling
  2. Opportunity sampling
  3. Purposive sampling
  4. Systematic sampling Correct answer.

Explanation

Systematic sampling uses a fixed interval to select participants from an ordered list. Opportunity sampling uses whoever is available, purposive sampling selects for specific characteristics, and snowball sampling relies on participants recruiting others.

Question 40Psychological inquiry and research methods

A researcher advertises a study in a university library and tests whoever volunteers during one afternoon. Which sampling method has been used?

  1. Systematic sampling
  2. Random sampling
  3. Volunteer (self-selected) sampling Correct answer.
  4. Stratified sampling

Explanation

Volunteer sampling occurs when participants put themselves forward in response to an advertisement, which can introduce self-selection bias. Random, stratified, and systematic sampling all involve a defined selection procedure from a population rather than self-selection.

Question 41Psychological inquiry and research methods

A researcher studying young people who engage in a rare behaviour asks initial participants to recommend others like themselves. Which sampling method is this?

  1. Snowball sampling Correct answer.
  2. Stratified sampling
  3. Systematic sampling
  4. Random sampling

Explanation

Snowball sampling is used to access hard-to-reach populations by having participants recruit further participants. Stratified, systematic, and random sampling all require a sampling frame from which participants are selected by the researcher.

Question 42Psychological inquiry and research methods

In an experiment, what is the purpose of randomly assigning participants to conditions?

  1. To prevent participants from knowing which condition they are in
  2. To ensure the sample represents the wider population
  3. To increase the statistical power by enlarging the sample
  4. To distribute participant variables evenly across conditions and reduce confounding Correct answer.

Explanation

Random assignment helps ensure that individual differences are spread across conditions, reducing the likelihood that participant variables confound the results. It does not improve representativeness, increase sample size, or by itself conceal condition allocation.

Question 43Psychological inquiry and research methods

A researcher wants to investigate whether a new teaching method improves test scores while controlling for differences in prior ability. Which design feature is most important?

  1. Using a larger number of participants in the experimental group
  2. Measuring test scores only after the teaching method is applied
  3. Allowing participants to choose which teaching method they receive
  4. Using a control group and randomly assigning participants to conditions Correct answer.

Explanation

A control group provides a comparison, and random assignment distributes prior ability across conditions so that differences in outcomes can be attributed to the teaching method. Letting participants choose introduces selection effects, and post-test-only measurement without a control limits causal inference.

Question 44Psychological inquiry and research methods

A study measures the same group of participants' mood before and after a mindfulness session. Which design is being used?

  1. An independent measures (between-subjects) design
  2. A correlational design
  3. A repeated measures (within-subjects) design Correct answer.
  4. A matched pairs design

Explanation

Repeated measures designs test the same participants in every condition, as when mood is measured before and after the session. Independent measures use different participants per condition, and correlational designs do not manipulate a condition.

Question 45Psychological inquiry and research methods

A researcher conducts a study with strong internal validity but wants to know how far the findings apply to other settings, times, and populations. Which type of validity is being considered?

  1. Face validity
  2. Internal validity
  3. External validity Correct answer.
  4. Construct validity

Explanation

External validity concerns the extent to which findings generalise beyond the specific study to other populations, settings, and times. Internal validity concerns causal control, construct validity concerns whether measures reflect the intended construct, and face validity is a superficial judgement.

Question 46Psychological inquiry and research methods

A researcher finds that participants in a study behave differently because they have guessed what the study is testing. This is an example of:

  1. Sampling bias
  2. Order effects
  3. Demand characteristics Correct answer.
  4. Experimenter bias

Explanation

Demand characteristics are cues in a study that lead participants to infer the expected behaviour and act accordingly. Experimenter bias concerns the researcher's influence, order effects concern the sequence of conditions, and sampling bias concerns participant selection.

Question 47Psychological inquiry and research methods

A researcher finds that participants' reaction times are faster in the second condition of a repeated measures experiment regardless of the manipulation. Which threat to internal validity does this illustrate?

  1. Practice effects Correct answer.
  2. Instrumentation bias
  3. Demand characteristics
  4. Selection bias

Explanation

Practice effects occur when repeated exposure to a task improves performance on later conditions, producing a change unrelated to the manipulation. Selection bias concerns group differences, demand characteristics concern cues about the aim, and instrumentation concerns changes in measurement.

Question 48Psychological inquiry and research methods

Which of the following is an example of an extraneous variable in a study on the effect of background music on concentration?

  1. The type of music played
  2. The volume of the background music
  3. The measure of concentration used
  4. The temperature of the testing room Correct answer.

Explanation

An extraneous variable is any variable other than the independent variable that could affect the dependent variable if not controlled, such as room temperature. The music volume and type are levels of the independent variable, and the concentration measure is the dependent variable.

Question 49Psychological inquiry and research methods

A researcher wants to ensure that a study has adequate statistical power. What is the most direct way to increase power when designing the study?

  1. Reducing the alpha level from .05 to .01
  2. Increasing the sample size Correct answer.
  3. Measuring the dependent variable less precisely
  4. Using a single-blind procedure

Explanation

Statistical power is the probability of detecting a real effect, and increasing sample size reduces the standard error, making genuine effects easier to detect. Lowering alpha makes the criterion more stringent and reduces power, blinding addresses bias, and imprecise measurement adds noise.

Question 50Psychological inquiry and research methods

A researcher reports that a result is statistically significant at p < .05. Which interpretation is most appropriate?

  1. If the null hypothesis were true, a result at least as extreme would occur less than 5% of the time Correct answer.
  2. The effect is large enough to be practically important
  3. The study is free from bias and confounding
  4. There is a 95% probability that the alternative hypothesis is true

Explanation

A p-value is the probability of obtaining a result at least as extreme as that observed, assuming the null hypothesis is true. It is not the probability that a hypothesis is true, it says nothing directly about effect size, and it does not address bias or confounding.