7 Assume that we want to construct a confidence interval. Do one of the following, as appropriate: Find the critical value ta/2 Find the critical value za/2 State that neither the normal distribution nor the t distribution applies. The confidence level is 99%, o is not known, and the histogram of 63 player salaries (in thousands of dollars) of football players on a team is as shown. 30- 20% 10- 4000 8000 12000 16000 20000 Salary (thousands of dollars) O A. ta/2 = 1.67 O B. ta/2 = 2.66 O C. Neither the normal distribution nor the t distribution applies. O D. Za/2 = 2.00