Easy1 markMultiple Choice
Planning and Designing Statistical InvestigationsdefinitionsreliabilityvalidityHigher

AQA GCSE · Question 04 · Planning and Designing Statistical Investigations

Which statistical term means 'the extent to which something gives results that are consistent'?

Answer options:

A.

reliability

B.

validity

C.

standard deviation

D.

unbiased

How to approach this question

Recall the definitions of the key statistical terms provided. The question is asking for the term that relates to consistency of results. Match this definition to one of the options.

Full Answer

A.reliability✓ Correct
The correct answer is reliability.
**Reliability** is about the consistency of a measurement. If you were to repeat the measurement or experiment under the same conditions, would you get the same or very similar results? For example, a reliable weighing scale will show the same weight each time you step on it (within a very small margin). \n**Validity**, in contrast, is about accuracy. It assesses whether the measurement actually captures what it is intended to capture. The weighing scale might be reliable (consistent) but not valid if it is consistently off by 2 kg.

Common mistakes

✗ Confusing reliability with validity. This is a very common mistake. Remember: Reliability = Consistency, Validity = Accuracy.

Practice the full AQA GCSE Statistics Higher Tier Paper 2

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