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Test: Week 3... Question 9 of 20 This test: 100 point(s) possible This question: 5 point(s) possible O Submit test 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 za/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 58 player salaries (in thousands of dollars) of 20- es football players on a team is as shown. Frequency 10- 0- ti 0 4000 8000 12000 16000 20000 Salary (thousands of dollars) e . . . . . Select the correct choice below and, if necessary, fill in the answer box to complete your choice. es O A. ta/2= sis (Round to two decimal places as needed.) d O B. Za/2= (Round to two decimal places as needed.) er O C. Neither the normal distribution nor the t distribution applies. d UI st