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An employee group for a national retailer claims that the mean time spent by employees on...

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. 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. Find the rejection region at alpha = .05 and state your conclusion in the context of the problem.

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Conclusion: There is evidence to conclude that the mean time spent by employees on personal phone calls is less than 10 minutes per day.

Following is the graph of rejection region:

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