How can engaged couples improve their chances of a happy marriage? Olthoff (1989) tested the communication quality of couples three months before and again three months after marriage. The data is for the husbands only of one random sample of 10 couples who had received ordinary (very minimal) premarital counseling from the ministers who were going to marry them. The scores are for communication quality. Test to see if the scores changed after three months of marriage. The population of difference in communication scores is normally distributed. Test at the 5% level.     Before After 126 115 133 125 126 96 115 115 108 119 109 82 124 93 98 109 95 72 120 104

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