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...

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 5.14 shows the observed pollution indexes of air samples in two areas of a city. Test the hypothesis that the mean pollution indexes are the same for the two areas. (Use α = 0:05.)