A cognitive psychologist is testing the affect of the employ of imagery on the memory of students. He collected the following data on a memory test after the learning situation where imagery was used on half of the participants. Rank the scores and perform a Mann-Whitney test at ? .05, using the 5 steps of hypothesis testing. (Hint: Use the formula to generate the U value for each sample.)
With Imagery Without Imagery
10 12 6 7
9 14 8 5
9 11 10 7
8 12 8 6