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  3. 1. the waiting times​ (in minutes) of a ran

1. The waiting times​ (in minutes) of a random sample of 21 people at a bank...

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Basic Math

1. The waiting times​ (in minutes) of a random sample of 21people at a bank have a sample standard deviation of 3.5 minutes.Construct a confidence interval for the population variance sigmasquared and the population standard deviation sigma. Use a 99 %level of confidence. Assume the sample is from a normallydistributed population. What is the confidence interval for thepopulation variance sigma squared​?

2.You are given the sample mean and the population standarddeviation. Use this information to construct the​ 90% and​ 95%confidence intervals for the population mean. Interpret the resultsand compare the widths of the confidence intervals. If​ convenient,use technology to construct the confidence intervals. A randomsample of 55 home theater systems has a mean price of ​$113.00.Assume the population standard deviation is ​$15.20.

Answer & Explanation Solved by verified expert
4.1 Ratings (690 Votes)
1Here s 35 and n 21df 21 1 20 1 099 001The critical values for 001 and df 20 are 212n1 74338 and 22n1 399968CI 20352399968    See Answer
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