Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 66 weekly reports showed a sample mean of ?% = 19.50 and a sample standard deviation of ?" = 5.20.(a)Estimate a 95% confidence interval for the population average number of contacts, ?".(b) Estimate a 99% confidence interval for the population variance, s X2 .

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Description: Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 66 weekly reports showed a sample mean of ?% = 19.50 and a sample standard deviation of ?" = 5.20.(a)Estimate a 95% confi

Confidence interval:The (1-α) % confidence interval for population mean µ, when σ is known is given…

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Problem 1P

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Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 66 weekly reports showed a sample mean of ?% = 19.50 and a sample standard deviation of ?" = 5.20.

(a)Estimate a 95% confidence interval for the population average number of contacts, ?".

(b) Estimate a 99% confidence interval for the population variance, s X2 .

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