Chapter 8: Q 11. (page 507)
More prayer in school Refer to Exercise
All samples to have
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California’s traffic People love living in California for many reasons, but traffic isn’t one of them. Based on a random sample of
a. Interpret the confidence level.
b. Name two things you could do to reduce the margin of error. What drawbacks do these actions have?
c. Describe how non response might lead to bias in this survey. Does the stated margin of error account for this possible bias?
a. Does the confidence interval provide convincing evidence that the true mean volume is different than
b. Does the confidence interval provide convincing evidence that the true mean volume is
More Oranges:The gardener in the previous exercise randomly selects
mandarin oranges from the tree and counts the number of seeds in each orange. Here are the data:
a. Graph the data using a dot plot.
b. Based on your graph, is it plausible that the number of seeds from oranges on this tree follows a distribution that is approximately Normal? Explain your answer.
Losing weight A Gallup poll asked a random sample of U.S. adults, “Would you like to lose weight?” Based on this poll, the
proportion who want to lose weight is
a. Interpret the confidence interval.
b. What is the point estimate that was used to create the interval? What is the margin of error?
c. Based on this poll, Gallup claims that more than half of U.S. adults want to lose weight. Use the confidence interval to evaluate this claim.
Refer to Exercise 55. Suppose that Gallup wanted to cut the margin of error in half from
a. Multiply the sample size by
b. Multiply the sample size by
c. Multiply the sample size by
d. Multiply the sample size by
e. There is not enough information to answer this question.
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