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 µ denote the mean time spent by employees on personal phone calls. Find the 95% confidence interval for µ Find the value of the standardized test statistic Find the rejection region at a= .05 and state your conclusion in the context of the problem

MATLAB: An Introduction with Applications
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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 µ denote the mean time spent by employees on personal phone calls.

  1. Find the 95% confidence interval for µ
  2. Find the value of the standardized test statistic
  3. Find the rejection region at a= .05 and state your conclusion in the context of the problem
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