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9 exam-style questions with model answers, plus 9 quick multi-choice questions — every question on the site for this standard, grouped by the 3 pages of notes they come from.
Write a full answer before you reveal the model one — that comparison is where the marks come from. Every block links back to the notes that teach it.
A reporter interviews the first 25 people leaving a gym and concludes New Zealanders exercise regularly. Name the sampling method and one reason it is biased.
A magazine mails a survey to subscribers and reports results from the 12% who replied. Explain how non-response could bias the results.
A company surveys its own customers and reports '92% are satisfied,' concluding its product is the best on the market. Evaluate this fully and suggest a better method.
A survey reports 60% support, margin of error ±4%. Between which two values is the true level of support likely to lie?
Option X polls 52% and option Y 48%, margin of error ±3%. Explain whether the report can claim X is more popular.
A report claims a party 'surged' from 40% (±3%) last month to 44% (±3%) this month. Evaluate the claim and explain what would make a change convincing.
A bar graph's y-axis starts at 90 instead of 0. Explain, in one sentence, why this can mislead.
A report finds towns with more ice-cream shops have more sunburn cases, and concludes ice cream causes sunburn. Explain the flaw.
A headline reads 'New supplement cuts cold risk by 50%!' based on a company study where the cold rate fell from 4 in 1000 to 2 in 1000. Evaluate the claim.