Upon hearing the test results Elizabeth's teacher feels that the entire class may have advanced working memory compared to grade level and would like to determine if the sample of (20 students) is significantly different from the population (distribution of means in this case). The class average on the reverse digit span task comes out to an 5. The population average is still a 6, with a variance of 100.

1. Provide the standard deviation of the sample (Elizabeth's class) and the z score. Determine if the class scores significantly different from the average class at the .05 level using a two-tailed test.

2. Report the results in APA style using slide 12 (chapter 5) as a guide. If the test is significant (p < .05) if it is not significant (p > .05).