A 40-Second Gap in the Lecture
You are listening to a six-minute lecture on sleep and memory for a section with eight questions. At 3:10 a door slams and you lose about 35 seconds. Your notes around the gap read: 'REM - procedural? / slow-wave - declarative / 2019 study: 8 h vs 5 h, recall +20% - but small n?' You did not hear the sentence that explained 'small n.' At 5:00 the lecturer says, 'As I said earlier, the sample was undergraduates, so be careful about generalising.' The question asks: 'What limitation does the lecturer identify in the 2019 study?' You have 20 seconds before the next question audio begins, and you cannot replay. The answer options include 'sample size and population,' 'measurement error,' 'conflicting prior research,' and 'short follow-up period.'
1. What should you write, and what evidence supports it?
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Write: the sample was small and limited to undergraduates, so the recall gain may not generalise. Evidence: your note 'small n?' plus the 5:00 repair 'the sample was undergraduates, so be careful about generalising.' The phrase 'as I said earlier' is a repair/recap marker - lecturers often restate a caveat when they think it mattered.
Combine the two fragments rather than choosing one: 'small n' alone is incomplete because it does not say who; 'undergraduates' alone misses the size issue. The wording 'may not generalise' matches the lecturer's hedge 'be careful about generalising.' Do not write 'the study was wrong' or '8 hours is better' - those overclaim and are not limitations. If the answer options include 'sample size and population,' that is the match.
2. How should you use the remaining two minutes of the lecture strategically?
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Listen for signposts and the lecturer's stance, not for new facts. With one gap and one uncertain answer, your priority is the lecturer's evaluative language: 'as I said,' 'importantly,' 'however,' 'some have argued.' These tell you what the lecturer thinks is central, which usually maps to at least one question.
Do not try to reconstruct the missing 35 seconds by pure inference; instead note any later recap verbatim. Keep writing in shorthand, leave a margin for the gap question, and mark uncertain items with a dot so you can revisit if the section allows review. If a question asks about the lecturer's attitude, the hedge 'be careful' is your evidence. Finally, check that you have answered every question; a plausible guess on a limitation question is usually better than a blank if there is no negative marking - but confirm the format before assuming.
3. Is it better to leave the limitation question blank or infer? Explain the scoring risk.
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Infer, but infer narrowly. If the section does not penalise wrong answers, a blank guarantees zero; a narrow inference from the repair sentence has a real chance of one mark. The risk is over-inference: writing 'the study was unreliable' or 'sleep deprivation causes memory loss' imports claims the lecturer did not make. A narrow inference stays inside the lecturer's hedge - 'small, undergraduate sample; limited generalisability.'
If the format does penalise wrong answers (some sections do not, but verify), then a blind guess on a topic you missed entirely is worse than leaving it; but here you are not blind, you have two converging clues. The decision rule: infer only when at least two independent cues point the same way. Here they do - 'small n' and 'undergraduates' both support a generalisability limitation. Write it and move on; do not spend the next question thinking about it.