please help

Refer to the accompanying data display that results from a sample of airport data speeds in Mops. Complete parts (a) through (b) TInterval below. (13.046,22.15) Click the icon to view a t distribution table. x = 17.598 Sx = 16.01712719 n=50 a. What is the number of degrees of freedom that should be used for finding the critical value ta / 2? df = (Type a whole number.) b. Find the critical value to / 2 corresponding to a 95% confidence level. ta/2= (Round to two decimal places as needed.)