As part of an evaluation of the efficiency of your local police force, you have gathered the PA/CJ SOC GER Case Pretest Posttest A 8 12 B 7 13 C 10 12 D 15 19 E 10 8 F 10 17 G 3 12 H 10 11 Case Pretest Posttest I5 7 J 15 12 K 13 20 L4 5 M 10 15 N 8 11 O 12 20 Construct frequency distributions for the pretest and posttest scores. Include a column for percentages. (HINT:

There were 20 items on the test, so the maximum range for these scores is 20. If you use 10 class intervals to display these scores, the interval size will be 2. Since there are no scores of 0 or 1 for either test, you may state the first interval as 2–3. To make comparisons easier, both frequency distributions should have the same intervals.)