A sample of students was given a diagnostic test before studying a particular statistics module, and again after completing the module. The data are as follows. Enter the values of each delta in the table below (enter WHOLE numbers here, no decimals, ie: 2, 3, -5) : Before After Delta (After - Before) 18 22 21 25 16 17 22 24 19 16 Question 322 pts Using the table above, find the following answers for questions: 32a-32c: na df mean (Xa) Sa 2.881 What is the sample size na above? Question 332 pts What are the degrees of freedom, df? Question 343 pts What is the mean x.? Round to one decimal place (x.x)