Faculty members in a state university system who resign within 10 years of initial employment are entitled to receive the money paid into a retirement system, plus 4% per year. Unfortunately, experience has shown that the state is extremely slow in returning this money. Concerned about such a practice, a local teachers’ organization decides to investigate. For a random sample of 50 employees who resigned from the state university system over the past 5 years, the average time between the termination date and reimbursement was 75 days, with a standard deviation of 15 days. Use the data to estimate the mean time to reimbursement, using a 95% confidence interval.
Answer to relevant QuestionsRefer to Exercise 5.67. After a confrontation with the teachers’ union, the state promised to make reimbursements within 60 days. Monitoring of the next 40 resignations yields an average of 58 days, with a standard ...Refer to Exercise 5.74. In exercise a. The cars in the study appear to have grossly different mileages before the devices were installed. Use the change data to test whether there has been a significant gain in mileage ...There appears to be a large variation in the mean PCB content across the 13 sites. How could we reduce the effect of variation in PCB content due to site differences on the evaluation of the difference in the PCB content ...For each of the situations, set up the rejection region: a. H0: μ1 = μ2 versus Ha: μ1 ≠ μ2 with n1 = 12, n2 = 15, and α = .05 b. H0: μ1 ≤ μ2 + 3 versus Ha: μ1 > μ2 + 3 with n1 = n2 = 25 and α = .01 c. H0: ...Conduct a test of H0: μ1 ≥ μ2 –2.3 versus Ha: μ1 < μ2 – 2.3 for the sample data summarized here. Use α = .01 in reaching your conclusions.
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