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311PracticeMidterm2Sp07Soutions

311PracticeMidterm2Sp07Soutions - Stat 311 Midterm 4 May...

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Stat 311 Midterm Name:_____ KEY ________ 4 May 2007 Section:__________________ 1 This is a closed book exam, except for the use of the normal table at the back of your book. You are allowed, however, to have one sheet (double-sided) of 8.5 x 11 paper with notes, either handwritten or typed. You may also use a calculator, although be sure to show your work. The exam consists of seven problems worth a total of 100 points. Point values for each part of a question are designated in parentheses at the beginning of the problem. Be sure to show your work as indicated in order to receive credit.
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2 Problem 1 (5+5+5+5 points): Consider samples A and B given below. Notice that the two samples are the same except for two values. A: 20 60 60 70 90 B: 20 30 70 90 90 Without calculating actual values for the statistics (except perhaps for the median), explain what effect changing the two 60s to 30 and 90 will have on each of the following statistics. Your answers should be along the lines of “the mean in sample B will ____ because …” Note that the mean of sample A is 60.
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