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The statistical investigation process
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The statistical investigation process
Question/problem, investigation method, data collection, analysis, interpretation and assumptions; Critiquing statistical claims and evidence
Example 1
Which is a statistical question suitable for an investigation?
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Answer: How do travel times vary among students?
- A statistical question anticipates variability and requires data from a group.
Example 2
Which is the correct investigation sequence?
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Answer: Question → collect → display/analyse → conclude
- Plan the question and collection before analysing, then draw a conclusion supported by the data.
Example 3
A survey of 11 classmates makes a claim about all 9000 adults in a town. What is the main limitation?
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Answer: The sample does not represent the target population
- The sampled group differs systematically from the population in the claim.
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