24. Special Needs Students Seven special needs students were studied to determine whether a social skills program caused improvement in pre/post measures and behavior ratings.8 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. Do you see any trend?

b. Calculate the correlation coefficient and interpret its value. Does the value of r confirm the trend that you see in the scatterplot? Explain.

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Student Pretest Posttest Evan 101 113 Riley Jamie Charlie Jordan Susie Lori 89 89 8 5 112 121 105 99 90 104 91 94 89 99