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Unformatted text preview: 2.2 a The mean is - CX, -3+2+...+5 32 x=-- =-- - 4 n 8 8 b To calculate the median, the observations are first ranked from smallest to largest: 2,3,3,4,4,5,5,6 Since n = 8 is even, the position of the median is 0.5(n+ 1) = 4.5, and the median is the average of the 4Ih and 5Ih measurements, or rn = (4 + 4)/2 = 4 c Since the mean and the median are equal, we conclude that the measurements are symmetric. The dotplot shown below confirms this conclusion. I I c The average premium cost in several different cities is not as important to the consumer as the average cost for a variety of consumers in his or her geographical area. 2.8 a Similar to previous exercises. The mean is b To calculate the median, rank the observations from smallest to largest. The position of the median is 0.5(n + 1) = 7.5, and the median is the average of the 7Ih and 8Ih ranked measurement or rn = (0.67 + 0.69)/2 = 0.68 ....
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This note was uploaded on 08/26/2008 for the course STATS 013 taught by Professor Leong during the Spring '07 term at UC Davis.
- Spring '07