A large plant has 1000 workers. A simple random sample of 25 workers is taken to find the ratio of work-loss days to total days employed during the previous calendar year. The following data were obtained from the survey:

Total work-loss days among the 25 individuals sampled: 250 Total days employed among the 25 individuals sampled: 4375

a. What is the estimated ratio of work-loss days to total days employed among workers in this plant?

b. What further information would you need to estimate the standard error of this estimate?

From the information given above, estimate the total work-loss days among the 1000 workers in the cohort.

d. It so happens that the 1000 workers in the plant in aggregate had 140,000 employment days during the previous calendar year. Based on this infor- mation, what would you infer about the estimate of total work-loss days computed in part (c)? Give reasons for your response.