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Historical delivery times for Jackson Trucking, Inc. have had a mean of 3 hours and a...

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Question

Basic Math

Historical delivery times for Jackson Trucking, Inc. have had amean of 3 hours and a standard deviation of 0.5 hours. A sample of22 deliveries over the past month provides a sample mean of 3.1hours and a sample standard deviation of 0.75 hours. Compute 95%confidence interval for the population variance. Select one: A.0.5770 21.0718 B. 0.3329 21.1487 C. 0.4439 21.5317 D. 0.666321.2376

I know the answer is B

(n-1)s2 / x2 mui/2 <= o2 <= (n-1) s2 / X2 1- mui/2

(22-1)0.75sqrt / 35.479 <= o2 <= (22-1)0.75sqrt /10.283

= 0.3329 <= o2 <= 1.1487

how do you get the 35.479 and 10.283?????

Answer & Explanation Solved by verified expert
4.3 Ratings (580 Votes)
The formula for the confidence interval is as followsThe values 35479 and 10283    See Answer
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