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**Unformatted text preview: **outliers. Problem 1.111 A)The mean is C, and the meadian is B ( the right skew pulls the mean to the right). B) Mean A, median A C) Mean A, median B (the left skew pulls the mean to the right). 1.114 The middle 95% fall within two standard deviations of the mean or between 234 and 298 days. The shortest 2.5% of all pregnancies are shorter than 234 days. 1.122 25% of of the observations fall below -.6745 (qnorm(.25)) 35% of the ob-servations fall above .3853 (qnorm(.65)). 1.140 A) The quartiles for a standard normal dist are ± . 6745 (qnorm(.25),1norm(.75)) 2 B) X . 25 = μ + σ * -. 6745 and X . 75 = μ + σ * . 6745 C) X . 25 = 255 . 2 and X . 75 = 276 . 8 3...

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- Fall '08
- Staff
- Economics, Normal Distribution, Standard Deviation, Histogram