The use bureau of labor and statistics reported that a person between the ages of 18 and 34 had an average of 9.2 jobs. To see if this average is correct, a researcher selected a sample of 8 workers between the ages of 18 and 34 and asked them how many different places they had worked. The results were as follows: 8, 12, 15, 6, 1, 9, 13, 2 . Find the 95% confidence interval for the true mean.