Review worksheet for Evaluating Reports 3_12 with answers.pdf

# C this is a poorly designed experiment margin of

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C. This is a poorly designed experiment. Margin of Error and polls 14. The reported margin of error depends only on the size of the sample. It is most appropriate for proportions around 0.5. True/False 15. A well-executed poll will have the same margin of error as a poorly-executed poll of the same size. True/False 16. An opinion poll is taken with a sample of size 7500. What will the margin of error be? Give your answer as a percentage with one decimal place. 17. An opinion poll is taken with a sample of size 80. Of the sample, 60% are men. What will the margin of error be for proportions reported from the men? A survey of first year students included 69 women and 99 men. They were asked how many servings of fruit they generally ate in a day. 30% of the women and 39% of the men said they ate no fruit or one serving of fruit per day. We are interested to see if there is evidence of a difference in the population. 18. What is the confidence interval for the difference? 19. Which statement best describes this confidence interval: A. As this confidence interval contains zero, we do not have evidence that there is a difference in the population. B. As the confidence interval contains zero we can reasonably conclude that more men eat zero or one fruit a day. C. We do not have enough information to draw any conclusions.

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This worksheet is provided by Dr Nicola Ward Petty and Dr Shane Dye of Statistics Learning Centre. Copying without acknowledgement of the source violates copyright. Many more exercises like these, with immediate feedback are available by joining NZ Stats 3 at statslc.com Page 3 Evaluating Reports worksheet Answers 1. True We calculate the sample statistics from the sample and we use them to make inferences about the population parameters. 2. False The NZ Census endeavours to ask the entire population of New Zealand. It provides population data.
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