Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value to /2. (b) find the critical value zo/2, or (c) state that neither the normal distribution nor the t distribution applies. 40- 30 The confidence level is 90%, o is not known, and the histogram of 57 player salaries (in thousands of dollars) of Frequency football players on a team is as shown. 20- 10- 0 4000 8000 12000 16000 20000 Salary (thousands of dollars) H Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. ta/2= 3H (Round to two decimal places as needed.) O B. za/2= K (Round to two decimal places as needed.) 3 T .C. Neither the normal distribution nor the t distribution applies. S (2 4 H 0 0 TICE