A doctor is interested in determining whether a film about exercise makes a significant
difference in 10 persons’ attitudes about exercise. The results of his questionnaire are shown.
A higher numerical value shows a more favorable attitude toward exercise. Is there enough
evidence to support the claim at level of significance 0.05, that there was a significant
difference in change of attitude? Also find the 95% confidence for the mean difference.
Before 12 11 14 9 8 6 8 5 4 7
After 13 12 10 9 8 8 7 6 5 5
Several Independent Populations, Homogeneity of Proportions (chi-square distribution)
