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In a random sample of 160 households in Atlanta, 105 of them stated they use AT&T to handle their long-distance phone calls. This sample will be used to construct a 92% confidence interval for the proportion of all households in Atlanta using AT&T to handle their long-distance calls.
(a) What single value would you use to estimate the true proportion of all households in Atlanta using AT&T to handle their long-distance calls? (3 decimal places)
(b) Determine the UPPER limit of a 92% confidence interval? (4 decimal places)
(c) Would a 95% confidence interval be wider or narrower than this one?
-The 95% CI would be wider than the 92% CI because you would be more confident in the 95% interval.
-The 95% CI would be narrower than the 92% CI because you would be more confident in the 95% interval.
-The 95% CI would be wider than the 92% CI because you would be less confident in the 95% confidence interval.
-The 95% CI would be narrower than the 92% CI because you would be less confident in the 95% confidence interval.
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