Review worksheet for Evaluating Reports 3_12 with answers.pdf

3 false sampling error exists because we are using a

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3. False - Sampling error exists because we are using a sample of observations rather than the whole population. Sampling error is unavoidable. 4. False Interviewers can affect the way people respond, leading to bias or other non-sampling error. Sampling error occurs regardless of the method of data collection. 5. Simple random sampling. 6. D. 7. True - You need to think hard about the purpose, the people who are being surveyed, and the manner in which the survey is being conducted. 8. True - For example if you have questions about how helpful and friendly a teacher is, and then get people to rate the teacher overall, this may get a different response than if you had previous questions about how much the teacher knew. 9. A. There are two ideas. Firstly, whether horse-racing is gambling, and secondly, whether jockeys are sportspeople. 10. False - For a study to be classified as an experiment it must involve planned interference in the natural order of events by the researcher. When there is no intervention, it is an observational study, not an experiment. 11. True - It is a rather silly experiment because obviously the people without milk will take longer to eat their Weetbix. However, as there is an intervention - providing milk or not, this could be classed as an experiment. 12. True - Factors that might affect the response variable are known as lurking variables, confounding variables or hidden factors. 13. A. The two groups were not assigned randomly, but according to team. There is no intervention or treatment. 14. True - The margin of error is largest for proportions of around 0.5, so the reported margin of error is about right for values near 0.5. 15. True - A well-executed poll has minimised the non-sampling error, but margin of error only accounts for sampling error. The reported margin of error depends on the size of the sample. 16. 1.2% 17. 14.4% 18. (-7.6%,25.6%) 19. A To have a 7-day free trial of NZ Statistics 3 at Statistics Learning Centre, go to http://course.statslc.com/ To find out more about discounted subscription for schools, email [email protected]
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