Question

An election poll shows your favorite candidate ahead with 52.4% of the vote, based on interviews with 921 randomly selected people.
a.* Find the two-sided 95% confidence interval for the percentage of the population in favor of your candidate.
b. Since this candidate has been your favorite for a long time now, and you want her to win, you are interested only in knowing that she has at least some percentage of the votes. In this case, would it be valid to make a one-sided confidence interval statement?
c. Find the one-sided 95% confidence interval that is appropriate, given the information in part b.
d. Find the similarly appropriate one-sided 90% confidence interval.
e. Write a brief paragraph describing how these confidence intervals shed important light on your candidate’s chances. In particular, how much more do you know now as compared to knowing only the 52.4% figure?


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  • CreatedNovember 11, 2015
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