2. Suppose we want to determine if a new drug was effective at causing weight loss. To determine this, we randomly select 10 subjects and weighed them before and after treatment. The resulting summary data for the differences are given below. Assume that the differences come from a normal distribution and that the data below is based on before-after.

Sample Size 10 Sample Differences Mean 6.25 Sample Differences Standard Deviation 7.52

a. Would you use a t or z test in this case? Explain b. Give the null and alternative hypotheses c. Run the test based on your choice in part a and make your decision d. Draw conclusions based on the real-world question