A conclusion needs a matching measurement and an account of what might shift it.
Read the verb in the claim
A garden writes that a new type of tray “caused” seedlings to sprout earlier. Its notes compare two weeks with different overnight temperatures. To support the narrower observation, report the sprouting times and conditions in those weeks. To support cause, compare both trays under matched temperatures or balance temperature across both tray types.
When a sentence says “only,” look for a counterexample without the required condition. When it says “on average,” individual exceptions may be expected. Choose evidence that could change your judgment of the specific claim.
Check the instruments before averaging
A moisture probe gives three closely clustered measurements. That shows repeatability for this setup. Now give it a known input near the operating range. If all readings are shifted, taking ten more can narrow the average without fixing that shift.
Report conditions and repeat spread alongside an estimate when they affect what the reader can infer. If comparison readings are far apart, check instrument agreement before attributing the difference to the treatment.
Apply the guide
A scale reads 81.1, 81.0 and 81.1 g for a certified 80.0 g mass. What do you infer?Reveal explanation
Its repeated readings agree closely and are high at this reference. The check does not establish an offset across the full range.
A team claims a habitat type shifts when feeding visits occur. Which records would help more than daily visit totals?Reveal explanation
Compare feeding visits in the same time windows in both habitats. Equal daily visit counts can hide a shift in their timing.
Turn the idea into practice.
Apply the rule to a new case, then explain your choice.
Practice this skillSources & authorship
Sources support scientific principles. Practice scenarios and teaching examples are original.
Original OpenExam guide
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OpenStax Biology 2e 1.1 The Science of BiologyOpenStax College Physics 1.3 Accuracy Precision and Significant Figures