Refer to the data in Exercise 7.5.14. There is one extremely low point in the control group. If that point is deleted, then the summary statistics change, as shown in the following table.

(a) What is the value of the t test statistic now?
(b) Does your conclusion about H0 change when the outlier is deleted?
Exercise 7.5.14
Improvement in quality of life was measured for a group of heart disease patients after 8 weeks in an exercise program. This experimental group was compared to a control group who were not in the exercise program.
Quality of life was measured using a 21-item questionnaire scores of 1-5 on each item. The improvement data are as follows and are plotted below:
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Experimental Control 2 21 4.9 6.1 0.2 6.0 6 1 1 1 0 5 0 1 3 4 6 2 1 7 4 2 3 6 1 4 5 6-21 on in 4 6 4 2 3 7 191244411602000- 246 20- 10 -20 Control Exp Treatment