A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. the sample mean was x = 7 years with a standard deviation of s = 2 years. assume the distribution of the time the employees have worked for the postal service is approximately normal. the hypotheses being tested are h0: μ = 7.5, ha: μ ≠ 7.5. a one-sample t test will be used. what are the appropriate degrees of freedom for this test?

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Erik Mitchell

11 July, 10:56

A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. the sample mean was x = 7 years with a standard deviation of s = 2 years. assume the distribution of the time the employees have worked for the postal service is approximately normal. the hypotheses being tested are h0: μ = 7.5, ha: μ ≠ 7.5. a one-sample t test will be used. what are the appropriate degrees of freedom for this test?

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Bennett Gilbert · Answer 1

You are given a simple random sample of 100 postal employees that is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. You are also given the sample mean that was x = 7 years with a standard deviation of s = 2 years. You are also given the hypothesis h0: μ = 7.5, ha: μ ≠ 7.5. The appropriate degrees of freedom for this test is 9.