Question: An experimenter predicted that the extraverted children would display more social motivation than introverted children. To test this idea, she had a teacher divide the 22 children in her class into two groups, introverts and extraverts. Each child was shown five pictures of people engaged in various activities and was asked to make up a story about each picture. The stories were then read by a trained judge who rated each story for affiliative images as an indication of social motivation. Each story received a score from 0 (no affiliative imagery) to 20 (consistent, high affiliative imagery). The total scores for the five stories are as follows:

Using the M-W U test, compare the two groups.