Question

a study of unexcused absenteeism among factory workers looked at a years reocords for 65 workers in an english factory and found the mean number of days absent was 10.34. Regard these workers in this year as a random sample of all workers in all the years as long as this factory does not change work conditions or benefits. Assume the population standard deviation of number of unexcused absences for all workers is known to be 18.867 days.

1- construc a 98% confidence inteval for the mean number of unexcused absences for all workers.

2-interpret your confidence interval in the context of the problem.

Answer 1

Solution

1.

2-interpret your confidence interval in the context of the problem

We are 98% confident that  mean number of unexcused absences for all workers lies between (4.896,15.784)