If the data distribution is symmetric, the skewness is a. positive. b. .5. c. 0. d. 1. Hide Feedback Correct Solution Correct Response c The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals a. 13. b. 576. c. 24. d. 28,561. Hide Feedback Correct Solution Correct Response c The sampling distribution of p ̄ 1 - p ̄ 2 is approximated by a normal distribution if _____ are all greater than or equal to 5. a. n 1 p 1 , n 1 (1 - p 1 ), n 2 p 2 , n 2 (1 - p 2 )