A random sample of 25 employees for the retailer showed a sample mean of 9.2 minutes and a standard deviation of 2 minutes. Assume that the time spent by employees on personal phone calls is normally distributed. Let u denote the mean time spent by employees on personal phone calls. (a) Find the 95% confidence interval for µ. (b) An employee group for a national retailer claims that the mean time spent by employees on personal phone calls is less than 10 minutes per day. Specify the correct null and alternative hypotheses you would use to investigate the employee group's claim. (c) Find the value of the standardized test statistic. (d) Find the rejection region at a-0.05 and state your conclusion in the context of the problem.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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A random sample of 25 employees for the retailer showed a sample mean
of 9.2 minutes and a standard deviation of 2 minutes. Assume that the time spent by employees on
personal phone calls is normally distributed. Let u denote the mean time spent by employees on
personal phone calls.
(a) Find the 95% confidence interval for µ.
(b) An employee group for a national retailer claims that the mean time spent by employees on
personal phone calls is less than 10 minutes per day. Specify the correct null and alternative
hypotheses you would use to investigate the employee group's claim.
(c) Find the value of the standardized test statistic.
(d) Find the rejection region at a-0.05 and state your conclusion in the context of the problem.
Transcribed Image Text:A random sample of 25 employees for the retailer showed a sample mean of 9.2 minutes and a standard deviation of 2 minutes. Assume that the time spent by employees on personal phone calls is normally distributed. Let u denote the mean time spent by employees on personal phone calls. (a) Find the 95% confidence interval for µ. (b) An employee group for a national retailer claims that the mean time spent by employees on personal phone calls is less than 10 minutes per day. Specify the correct null and alternative hypotheses you would use to investigate the employee group's claim. (c) Find the value of the standardized test statistic. (d) Find the rejection region at a-0.05 and state your conclusion in the context of the problem.
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