12.58 Social Skills Training A social skills training program was implemented with seven mildly challenged students in a study to determine whether the program caused improvement in pre/post measures and behaviour ratings. For one such test, the pre- and posttest scores for the seven students are given in the table.

a. What type of correlation, if any, do you expect to see between the pre- and posttest scores? Plot the data. Does the correlation appear to be positive or negative?

b. Calculate the correlation coefficient, r. Is there a significant positive correlation?

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Subject Pretest Posttest Jazib 101 113 Ned 89 89 Jasper 112 121 Charlie 105 99 Tom 90 Feryaal Lori 91 89 104 94 99