A social psychologist finds that in a typical 15-minute conversation with a partner, a person performs mu = 32.1 nods of the head. In a sample of n = 29 couples experiencing marital difficulty, the average number of nods is M = 22.6 with s = 7.6. Did marital difficulty reduce nods? What is the correct HT? Explain. Is this a one-tail or a two-tail test? What is the 99% CI for mu