Exercise1:
The following data show the required operation time (minutes) of 2 surgeons for the same surgical procedure. Analyze whether there is a statistical difference in operation time between 2 surgeons.
Doctor A（11 Cases）：39, 33, 48, 34, 43, 38, 32, 42, 36, 44, 31
Doctor B（10 Cases）：51, 40, 54, 45, 35, 49, 47, 53, 41, 69
Exercise2:
Data show the effect of 2 therapeutic drugs on survival time (weeks) in a disease animal model. Analyze whether there is a statistical difference in survival time between 2 drugs.
Drug A：34, 5, 11, 5, 20, 24, 8, 14, 14, 13, 14, 41, 13, 15, 19, 12
Drug B：8, 14, 8, 8, 8, 11, 25, 23, 9, 12, 13
