You are interested in finding a 91% confidence interval for the average number of miles that Americans drove last year. Based on historical records, you know that the standard deviation for annual miles driven is 3518 miles. Suppose you survey 92 randomly selected Americans and find that they averaged 14,289 miles with a standard deviation of 3096 miles. Round your answers to the nearest whole number. B. With 91% confidence the mean number of miles driven by all Americans last year is between__________  and  ___________ . C. If many groups of 92 randomly selected Americans were surveyed, then a different confidence interval would be produced from each group. About_________ percent of these confidence intervals will contain the true population mean number of miles driven by Americans and about__________percent will not contain the true population mean number of miles driven by Americans.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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You are interested in finding a 91% confidence interval for the average number of miles that Americans drove last year. Based on historical records, you know that the standard deviation for annual miles driven is 3518 miles. Suppose you survey 92 randomly selected Americans and find that they averaged 14,289 miles with a standard deviation of 3096 miles. Round your answers to the nearest whole number.

B. With 91% confidence the mean number of miles driven by all Americans last year is between__________  and  ___________ .

C. If many groups of 92 randomly selected Americans were surveyed, then a different confidence interval would be produced from each group. About_________ percent of these confidence intervals will contain the true population mean number of miles driven by Americans and about__________percent will not contain the true population mean number of miles driven by Americans.

 

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