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

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STA 103 Final Exam Fall 2007 I. H. Dinwoodie NAME Calculator and formula sheet allowed.

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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 0 : 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 year’s final exam will be like last year’s but with different numbers. However some numbers will not change. π will be the same.” Does this joke work in a statistics class that uses our book? No, π = 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 μ , with variance σ 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 μ is estimated by (a) 0.0 (b) 0.05 (c) 0.5 X (d) 10.0 (e) 38.0

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

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