Fourteen Turtles or Thirty? Comparing a Journal and a Website
A class is studying a field trip to a wetlands center. Source 1 is a student’s journal: “I counted 14 turtles on the log. Our guide, Ms. Ortiz, said the center has 30 turtles, but most hide. I saw a heron catch a fish at 10:15.” Source 2 is the center’s website: “The center is home to 30 turtles and more than 40 bird species. Visitors often see turtles sunning on logs in the morning.” A student claims, “The website says 30 turtles, but the journal counted 14, so one source is wrong.” The teacher asks the class to explain the difference without assuming either source is false.
1. Explain why the two sources give different turtle numbers without either being wrong.
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The sources answer different questions. The journal records what one visitor counted at one moment: 14 turtles visible on a log. The website states the center’s total population: 30 turtles. The journal even includes the guide’s explanation that most turtles hide, which supports the idea that only some would be visible. So 14 is a snapshot, while 30 is a census. The numbers can both be accurate because they describe different scopes, not the same count.
2. Which source is more reliable for the number of turtles at the center, and which for what a visitor saw that day?
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For the total number at the center, the website is more reliable because it states the center’s own population figure. For what a visitor saw that day, the journal is more reliable because it is a firsthand, timed observation: 14 turtles on the log at about 10:15. Reliability depends on the question. The journal’s 14 should not be treated as the total population, and the website’s 30 should not be treated as a count of visible turtles that morning.
3. A student wants to know whether visitors usually see turtles in the morning. Which source helps more, and what is missing?
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Both sources help a little, but neither proves “usually.” The website says visitors “often” see turtles sunning in the morning, which is relevant but vague; “often” is not a measured rate. The journal gives one morning observation, which is firsthand but only one visit. To answer “usually,” the class would need many morning observations or center records across days. The two sources together suggest the claim is possible, not that it is established.