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Section II Sample Examination Two 5. A medical research group is interested in comparing the effectiveness of two new medications in reducing cholesterol levels in adult males ranging in age from 35-65 years of age who have exhibited elevated cholesterol levels for at least six months, Four hundred men with elevated cholesterol levels in this age group were randomly selected in New Ycrrk City and 340 men were randomly selected in Philadelphia. It is suspected that results will differ greatly between the two cities due to a recent 'heart health' initiative in Philadelphia. Describe a randomized block design to conduct this experiment. 53 ot any part of thls page ls lllegal.
f,{ Sample Examination Two Seetion [I Section II Fart B Time-25 minutes Question 6 Percent of Section II erade-25 Direetions: Show'all your work. Indicate clearly the methods you use, because you wiil be graded on the correctness of your method as rvell as on the accuracy of your results and explanations. 6. In 1 908 W. S. Gosset wrote a paper titled, "The Probable Error of a Mean". in the paper Gossett reported on the corn yieid using two different kinds of seeds. The first seed was the usual seed used by farmers in England at that time. The second seed type was kilndried. Each type of seed was planted in adjacent plots, accounting for 11 pairs of "split" plots. The data are given belorv. The numbers are in pounds per acre. Plot Regular Kiln-Dried 1 903 20a9 2 1935 1915 J 1910 2011 A L+ 2496 2463 5 2 108 2180 6 1961 1925 7 2060 2122 8 441 t482 9 612 1542 10 316 1443 1t 5il 153 5 The following computer outputs show the descriptive statistics of the two variables and a regression output which resulted from fitting a least squares regression line using yield from "regular" seed to predict yield from "kiln-dried" seed. Variable N Mean Medi-an TrMean StDev SE Mean Regular 11 1841 191-0 1-827 343 t_03 Kiln-Dri 1l- 1875 L925 1858 333 t-00 Variable Minimum Maximum Ql- Q3 Regular l-31-6 2496 1511- 2060 xiln-ori L443 2463 1535 2L22 Predictor onstrant Ponrr'l rr copying or reusing any part of this page is lllegal. Coef StDev 120 .4 LL6 .'l 0.95293 0.06241 R-Sq=l$.39 R-Sq (adj ) =95.98 T 1-.03 15 .21 P 0 "329 0. 000
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