13. Which of the following is an example of descriptive statistics? a) In a sample of 1,000 college students, their average I.Q. score is 115. b) The average height of all NBA basketball players is 6'7". c) Nine out of 10 doctors recommend non-aspirin pain reliever. 14. The symbol used to represent the variance is a) N b) S c) $2 d) n 15. What is the median of the data set 3, 8, 11, 15, 6, 8 and 5? a) 7 b) 8 c) 9 d) 10