finalanswersfall07

finalanswersfall07 - STA 103 Final Exam Fall 2007 I. H....

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Unformatted text preview: STA 103 Final Exam Fall 2007 I. H. Dinwoodie NAME Calculator and formula sheet allowed. STA103 Fall 2007 Final 1 1. (6 points) During the 1950s, radioactive waste leaked from a storage area near Hanford, Washington, into the Columbia river. Exposure and Mortality (deaths per 100,000) were measured in 4 counties: County Exposure Mortality Clatsop 8.3 240 Columbia 6.4 180 Gilliam 3.4 130 Hood River 3.8 170 (a) Get the intercept and slope for the least-squares regression line for Mor- tality as a function of Exposure. y=80.4 + 18.2 x (b) Predict the mortality rate at exposure level 4.0. 153.2 (c) Software gave a t-statistic of 3.4 on 2 degrees of freedom for the slope estimate, and a p-value of 0.078 for the two-sided test of nonzero slope. In the one-sided test of positive slope at level .05 ( H : true slope = 0 vs H a : true slope > 0, and true slope > 0 means exposure is harmful), is the null hypothesis accepted or rejected? p-val=.038, reject. 2. (1 point) It is sometimes said in mathematics that This years final exam will be like last years but with different numbers. However some numbers will not change. will be the same. Does this joke work in a statistics class that uses our book? No, = 3 . 14 in math, in our book it is a proportion so it can be different things. If you say yes then you are too polite, although I did give credit because maybe I missed the joke. STA103 Fall 2007 Final 2 Choose the best answer. (3 points each) 3. Women in 1975 in a certain city had normally distributed incomes that averaged , with variance 2 . A sample of 100 was taken randomly and it was found that x = 19 . 0 and s = 5 . 0 (in $1,000). The standard error of the estimate 19 . 0 for is estimated by (a) 0.0 (b) 0.05(b) 0....
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This note was uploaded on 09/29/2008 for the course STAT 103 taught by Professor Dinwoodie during the Fall '08 term at Duke.

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finalanswersfall07 - STA 103 Final Exam Fall 2007 I. H....

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