Consider the data in Exercise 8.2.9. There are two outliers among the 28 differences: the smallest value,

Question:

Consider the data in Exercise 8.2.9. There are two outliers among the 28 differences: the smallest value, which is 2. and the largest value, which is 18. Delete these two observations and construct a 95% confidence interval for the mean increase, using the remaining 26 observations. Do the outliers have much of an effect on the confidence interval?
Data From Exercise 8.2.9