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What should be checked before comparing the results of an experiment?

Answer and explanation

Correct answer: Whether measurements were made in the same units

Direct answer: Option B, checking whether measurements use the same units, should be done before comparison. A number has meaning only with its unit. For example, 2 m and 150 cm are not directly compared as 2 and 150 until one value is converted: 2 m = 200 cm, so 200 cm is greater than 150 cm. First inspect every value and its unit, convert all values to one common unit, and then compare them. Option B is correct because common units prevent a false conclusion. Option A is irrelevant: a hypothesis title does not tell whether numerical data are comparable. Option C is irrelevant because equipment colour does not affect the unit or value. Option D is not the required check; different students may collect useful data if the method and units are consistent. Memory cue: before comparing numbers, compare their units.

Related tags

Data ComparisonStandard UnitsExperimental ResultsHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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