A study is conducted to evaluate the effectiveness of a weight loss program. A group of 20 participants undergoes the program, and their weights are recorded before and after completing the program. The table below shows the weights (in kilograms) of a sample of five participants: Participant Before (kg) After (kg) 1 80 75 2 65 62 3 72 70 4 68 67 5 90 85 What is the number of pairs of data in this study? Question 8 Answer a. 5 b. 10 c. 15 d. 20