1. Dr. Smith has noticed that the happiness of her students seems to be related to the amount of sleep they get. She hypothesizes that more sleep predicts greater overall happiness. She administers a survey to measure average hours of sleep and overall happiness level. Her results are as follows: Subject Hours Sleep per night Happiness rating (1-10 scale) 1 7.2 7.9 2 5 4.5 3 8.3 2.2 4 12 8.9 5 10 10 6 2 7 7 6 6.2 8 8 3 9 9 5 10 5.6 9 11 8.5 7.7 12 9 5 13 11 3 14 10 5.4 15 8 7 16 6 8.1 17 6 9 18 8 9.2 19 8 7 20 6.5 10 21 7 3 22 5.8 6 23 10 2