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Which observation plan would provide the most reliable comparison?

Answer and explanation

Correct answer: Measuring both groups with the same instrument at the same time over several days

The direct answer is A. A fair comparison changes or compares the intended factor while keeping measurement conditions as similar as possible. Using the same instrument reduces instrument differences, measuring at the same time reduces effects of daily timing, and repeating measurements over several days reduces the effect of one unusual day. Option A therefore gives the strongest reliability. Option B mixes instruments and times, so differences may come from equipment or timing rather than the groups. Option C measures only one group and only once, so there is no proper comparison or repetition. Option D depends on memory, which is easily inaccurate and cannot be checked precisely. Good experiments use a consistent procedure, careful records, and repeated measurements. Exam cue: same method, same conditions, repeated trials.

Related tags

Reliable-ComparisonConsistent-MethodRepetitionInstrumentScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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