a researcher wants to determine if daily walks together strengthen a marriage. one group of wives and one group of husbands are selected and have daily walks. after 2 weeks, all are asked if they felt their marriage was stronger based on the walks and the results of the two groups are compared. to be a valid matched pair test, what should the researcher consider in creating the two groups? group of answer choices that the both groups were positive on marriage before the walks that the wives group was positive on marriage before the walks that the husbands and wives selected were married to each other that all husbands and wives in the test had been married about the same amount of time