For the test scores first presented in problem 2.6 and reproduced below, compute a mean and standard deviation for both the pretest and post-test. Based on these statistics, write a paragraph...

For the test scores first presented in problem 2.6 and reproduced below, compute a mean and standard deviation for both the pretest and post-test. Based on these statistics, write a paragraph describing how the sample changed from test to test.

problem 2.6

Below are four variables for 30 cases taken from a national survey. Age is reported in years. The variable “happiness” consists of answers to the question “Taken all together, would you say that you are (1) very happy, (2) pretty happy, or (3) not too happy?” Respondents were asked how many sex partners they had over the past five years. Responses were measured on the following scale: 0-4 = actual numbers; 5 = 5-10 partners; 6 =11-20 partners; 7 = 21-100 partners; and 8 5 more than 100. For each variable, find the appropriate measure of dispersion.