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Unformatted text preview: Tutorial 2 1. Airfreight breakage A substance used in biological and medical research is shipped by airfreight to users in cartons of 1000 ampules. In the (data) , X is the number of times the carton was transferred from one aircraft to another over the shipment route, and Y the number of ampules found to be broken upon arrival. A linear regression model Y = β + β 1 X + ε is used. (a) Write down the estimated regression model. Plot the estimated regression func tion and the data. Does the linear regression function appear to give a good fit here? (b) Obtain a point estimator of the expected number of broken ampules when X = 1. (c) Estimate β 1 with 95% confidence interval. Interpret your interval estimate (d) conduct a ttest to decide whether or not there is a linear association between number of times a carton is transferred X and the number of broker ampules Y with significant level α = 0 . 05? what is the Pvalue of the test?...
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This note was uploaded on 10/04/2010 for the course STAT ST3131 taught by Professor Xiayingcun during the Fall '09 term at National University of Singapore.
 Fall '09
 XIAYingcun
 Regression Analysis

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