Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week....

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Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week....

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 65 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviation was 5.2.

a)Develop a 90% confidence interval estimate of the population mean number of weekly customer contacts for the sales personnel.

b)Develop a 95% confidence interval estimate of the population mean number of weekly customer contacts for the sales personnel.

c)Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this result seem reasonable? Explain.

math Statistics-And-Probability

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sola tion mean X IS 5-2 n 65 Sample&DS 0.9 5.2 VES 19.5 t 16670 (0-64u 18 42520. 515 Paga No. Cuu the 95% co nledence interva0 estimate 1s 1:2365 1:2131 20 7869 As the e intemaD Le so the widti 4 ts censidence interve cr eased Candi dence inte

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