Use your calculator to find critical values such that the following statements are true. Your task is to determine the critical values below. a. P(-ta/2 ststa/2) = 0.95, where df = 13 b. P (ts-ta) = 0.01, where df = 8 c. P (ts-ta/2 or tta/2) = 0.10, where df = 7 d. P(ts-ta/2 or t or tta/2) = =0.01, where df = 7 Click the icon to view the table of critical values of t. (Use 3 decimal places in all questions please.) (Use 3 decimal places in questions a-d please.) a. The upper tail critical value ta/2= b. The lower tail critical value to = c. The upper tail critical value ta/2= The lower tail critical value t/2= d. The upper tail critical value tx/2 = The lower tail critical value t/2=