Which of these settings does not allow use of a matched pairs t procedure?
A. You interview both the husband and the wife in 64 married couples and ask each about their ideal number of children.
B. You interview a sample of 64 unmarried male students and another sample of 64 unmarried female students and ask each about their ideal number of children.
C. You interview 64 female students in their freshman year and again in their senior year and ask each about their ideal number of children.