Assume that we want to construct a confidence interval. Do one of the​ following, as​ appropriate: (a) find the critical value tα/2​, ​(b) find the critical value zα/2​, or​ (c) state that neither the normal distribution nor the t distribution applies. The confidence level is 90 %, σ is not​ known, and the histogram of 52 player salaries​ (in thousands of​ dollars) of football players on a team is as shown.