Two sections of a class in statistics were taught by two different methods. Students’ scores on a standardized test are shown in Table 5.13. Do the results present evidence of a difference in the effectiveness of the two methods? (Use α = 0:05.)

Table 5.13 Data for Exercise 1. Class A Class B 74 76 78 79 97 75 92 76 79 82 94 93 88 86 78 82 78 100. 71 69 93 94 85 84 70