Suppose 60 different survey organizations visit eastern Tenn

Suppose 60 different survey organizations visit eastern Tennessee to estimate the average number of years of schooling completed among adults age 25 and over. Each organization surveys 400 people and reports a 90% confidence interval. Of these 60 intervals, how many of these intervals would you expect to contain the true population average?

Solution

of these 60 intervals, 90% of the intervals or 90% of 60 = 54 intervals will contain true population average.