Effect Size and Post-Hoc Tests For each of the following studies, use the information given to calculate the effect size and then do post-hoc tests and interpret the results. 1. Fifteen third-grade students participated in a memory experiment. Five students had a story read to them by a teacher, five read the story themselves, and five saw a video of the story. Each student then took a memory test on 12 items from the story. The children who heard their teacher read the story recalled an average of 5 items. Those who read the story had an average recall of 9 items, and those who saw the video tape recalled an average of 10 items. Source SS df MS E between 48 2 24 4 within 72 12 6 Total 120 14