Question

19. A market research firm is interested in determining the proportion of
households that are watching a particular sporting event. To accom-
plish this task, it plans on using a telephone poll of randomly chosen
households.
(a) How large a sample is needed if the company wants to be
90 percent certain that its estimate is correct to within +0.02?
(b) Suppose there is a sample whose size is the answer in part (a).
If 23 percent of the sample were watching the sporting event, do
you expect that the 90 percent confidence interval will be exactly
of length 0.02, larger than 0.02, or smaller than 0.02?
(c) Construct the 90 percent confidence interval for part (b).
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Answer 1

Answer:

A market research firm is interested in determining the proportion of households that are watching a particular sporting event. To accomplish this task, ...