HSC Investigating Science Multiple-Choice Quiz

Try 4 original practice questions. Choose an answer for each question to see your score and the explanations.

1. Which change is most likely to improve the precision of an estimate of the mean? Discard all measurements below the mean Take more independent measurements under the same conditions Report fewer decimal places without changing measurement Round measurements before recording them

2. A scale reads 2 g when unloaded. Which kind of error will this produce if it is ignored? Random variation about zero A sampling-frame error A systematic offset A change in the sample mass

3. Why include a control group in an experiment? To ensure every participant receives the same intervention To guarantee the hypothesis is correct To provide a comparison without the intervention To remove the need to measure the outcome

4. What conclusion is justified when two variables are correlated in an observational dataset? Their measurement units must match There can be no confounding variables They show an association in that dataset One necessarily causes the other

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