1. In a sample of 89 blue collar workers at your company the average job satisfaction rating (in a scale from 0 -100) averaged 57 with a standard deviation of 12. In a sample of 78 white collar workers the average job satisfaction was 80 with a standard deviation of 17.

a) At the .01 level was there a statistically significant difference in the average job satisfaction between the groups? (p = 0)

b) Answer the question in a) with a yes or no response based on the results of the test

2 ) The time to solve a puzzle is being measured for two groups, elderly (over 70) and kids (under 10). For the 120 adults tested it took an average time of 24 minutes with a standard deviation of 4 minutes to solve the puzzle. For the sample of 88 kids it took an average time of 22 minutes with a standard deviation of 5 minutes to solve the puzzle.

a) At the .05 level is there a difference in the average time between kids and adults to solve the puzzle? (p = .002)

b) Based on a) how do explain the 2 minute difference in average of the two groups?