3. The attendance records for a sample of 36 women's basketball games at one university revealed that the mean number of fans at each game was 2124.3 with a standard deviation of 241.8. In order to predict ticket sales for next year, the athletic department needs a confidence interval for attendance at these games. Use a 95% confidence level. a) Find the critical value ta/2. Round to three decimal places. H = 2124.3 0 = 241.8 b) Find the margin of error using the formula E = ta/2 . -. Round to one decimal place. c) Construct the confidence interval using the formula x - E