1. Which of the following is not needed to compute a t-statistic, and do a one-sample t-test? (Hint: This is the difference between a z-test and a t-test). a) A hypothesized value for the population mean b) The value of the population variance or population standard deviation c) The value of the sample mean d) The value of the sample variance or sample standard deviation 2. You have a new anti-depression drug you want to test. You know the u of the depression scores for the general population of depressed patients, but not the o. You should do a.. a) One-sample z-test b) One-sample t-test c) t-test for 2 independent samples d) t-test for 2 related samples