Chapter_13_-_Recommended_Problems_-_Answers - 13.3(a(b When...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
13.3 (a) When X = 0, the estimated expected value of Y is 16. (b) For each increase in the value X by 1 unit, you can expect a decrease in an estimated 0.5 units in the value of Y . (c) 13 ˆ Y 13.13 r 2 = 0.75. So, 75% of the variation in the dependent variable can be explained by the variation in the independent variable. 13.15 Since SST = SSR + SSE and since SSE cannot be a negative number, SST must be at least as large as SSR . 13.17 (a) r 2 = 0.9015. So, 90.15% of the variation in audit newsstand sales can be explained by the variation in reported newsstand sales. (b) 42.1859 YX S (c) Based on (a) and (b), the model should be very useful for predicting audited sales. 13.35 (a) b 0 = 169.455, b 1 = 1.8579 (b) Y ˆ = 76.56 (c) No need to worry about plotting residuals because you won t be asked to do that in the exam. (d) The Durbin-Watson test statistic of 1.18<1.27. There is evidence of positive autocorrelation among the residuals. (e) The plot of the residuals versus temperature indicates that positive residuals tend to occur for the lowest
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/31/2011 for the course MGT C06 taught by Professor A.stawinoga during the Fall '10 term at University of Toronto.

Ask a homework question - tutors are online