A social skills training program, reported in Psychology in the Schools, was implemented for seven students with mild handicaps in a study to determine whether the program caused improvement in pre/post measures and behavior ratings. For one such test, these are the pretest and posttest scores for the seven students:

a. Draw a scatterplot relating the posttest score to the pretest score.
b. Describe the relationship between pretest and posttest scores using the graph in part a. Do you see any trend?
c. Calculate the correlation coefficient and interpret its value. Does it reinforce any relationship that was apparent from the scatterplot? Explain.

Student Pretest Posttest Earl Ned Jasper 112 Charlie 105 Tom Susie Lori 101 89 113 89 121 90 91 89 104 94