Question

Let p be the population proportion for the situation. (a) Find point estimates of p and q, (b) construct 90% and 95% confidence intervals for p, and (

Confidence intervals
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asked 2021-06-23
Let p be the population proportion for the situation. (a) Find point estimates of p and q, (b) construct 90% and 95% confidence intervals for p, and (c) interpret the results of part (b) and compare the widths of the confidence intervals. In a survey of 1035 U.S. adults, 745 say they want the U.S. to play a leading or major role in global affairs.

Expert Answers (1)

2021-06-24
(a)\(\displaystyle\overbrace{{{p}}}={0.7198},\overbrace{{{q}}}={0.2802}\)
(b)90% confidence interval: (0.6968, 0.7428)
95% confidence interval: (0.6924, 0.7472)
(c)The 95% confidence interval is wider than the 90% confidence interval.
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