A researcher would like to determine whether confinement has any effect on couples' relationship satisfaction. When asked to rate it out of 100, couples in the US typically report an average satisfaction of = 85 with = 10. The distribution of is normal. For a sample of n = 16 couples confined, the researcher found an average of M = 91.

1. State the study hypotheses (You may elect to either use symbols or write out your hypotheses)
2. Is the data sufficient to conclude that the confinement had an effect on couple's relationship satisfaction? Use a two-tailed test with = .05. In your answer, state (1) the boundaries of the critical region, (2) the test statistic (z-score) for your sample and, (3) your decision.
3. What if we use a one-tailed test with = .05? State (1) the boundaries of the critical region, (2) your decision.
4. What if we use a one-tailed test with = .01? State (1) the boundaries of the critical region, (2) your decision.
5. What if we use a two-tailed test with = .01? State (1) the boundaries of the critical region, (2) your decision.
6. Compute Cohen's d for this study.