5. A researcher is investigating the length of time that postal employees work f

Question

5. A researcher is investigating the length of time that postal employees work for the US. postal service. Specifically, he is testing the hypotheses H0: 7.5 and Ha: * 7.5 to determine if there is evidence that the mean time has changed from the 7.5 years known to be true 20 years ago. Using an SRS of 100 postal employees he found that the average time these employees had worked for the postal service was7 years, with standard deviation s2 years. Assume the distribution of the time the population of employees has worked for the postal service is approximately Normal, with mean . Let a-0.05. Reference: Ret 7-1 The appropriate degrees of freedom for the one-sample t test are: 99. 20. 100. 101

Explanation / Answer

Degrees of freedom = n - 1 = 100 - 1 = 99 .

Required degrees of freedom = 99 .

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