Can you go into detail for letter C please

Does calling patients increase treatment compliance? Compliance for a particular treatment is normally u = 7 days, o = 3 days. The doctor randomly selects n = 10 participants and calls them to follow up on their treatment. She then measures treatment compliance after 2 weeks and finds that the sample that was called had a compliance rate of M = 9 days. a) Is this a one or two-tailed test? b) What are the null and alternative hypotheses? c) What is the alpha level and critical value? d) Calculate a z-score, and describe the results in plain English. e) Calculate Cohen's d to test effect size. f) Calculate power