seven special needs students were studied to determine whether a social skills 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: student pretest posttest evan 101 113 riley 89 89 jamie 112 121 charlie 105 99 jordan 90 104 susie 91 94 lori 89 99 draw a scatterplot relating the posttest score to the pretest score. do you see any trend? calculate the correlation coefficient and interpret its value. does the value of r confirm the trend that you see in the scatterplot? explain.