Ch#2 Statistic Homework

# Ch#2 Statistic - a Question 2.8 2.76 2.132 2.136 2.156 y var iable because t his gr aphis st r ong t he cor r elatshow r.876 The fornot is linear

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Unformatted text preview: a. Question 2.8, 2.76, 2.132, 2.136, 2.156 y var iable because t his gr aphis st r ong t he cor r elatshow r .876. The fornot is linear. osit ive, and t he r elat ionship is only supposed t o ion is elat ionship m causat ion. 2.8) a/c. 2.76) a/c. b. There is not necessarily a weak or strong relationship within this data because the correlation is exactly .5. With this kind of correlation we cant really make any assumption about the data because we know that the data doesn't relate to each other nor relate to each other. Since r 2 is only .254, the regression was only 25% successful in explaining the response. In lamex terms it means that this regression line isnt really reliable in explaining the relationship between U.S returns and overseas returns. 2.132) a. b. c. Data A: r=.409 2.136) a. s=.869 b/c. the slope tells us the overall t rend of the data and helps us extrapolate estimates. Especially since the regression is fairly close to one this slope is highly useful in estimating one factor with the other one. 1.156) n=1314 women Data B: r=.410 Data C: r=.864 A) Two-Way Table dead alive total smoker 139 443 582 nonsmoker 230 502 732 total 369 945 1314 percentage of smokers that are still alive = (433/582)= 76% percentage of non-smokers that are still alive = (502/732) = 69% B) Ages18-44 percentage of smokers still alive = (269/269+19)*100 = 93% percentage of non-smokers still alive = (327/327+130 = 96% Ages 45-64 percentage of smokers still alive = (167/167+78)*100 = 68% percentage of non-smokers still alive = (147/147+52)*100 = 74% Ages 65+ percentage of smokers still alive = (7/42+7)*100 = 14% percentage of non-smokers still alive = (28/165+28)*100 = 15% ...
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## This note was uploaded on 10/12/2008 for the course STATISTICS 270 taught by Professor Wanapandeep during the Spring '08 term at Ill. Chicago.

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Ch#2 Statistic - a Question 2.8 2.76 2.132 2.136 2.156 y var iable because t his gr aphis st r ong t he cor r elatshow r.876 The fornot is linear

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