# HW #2 - STAT 420 Homework#2(10 points(due Friday February 2...

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STAT 420 Spring 2007 Homework #2 (10 points) (due Friday, February 2, by 4:00 p.m.) From the textbook: 4.5 Prove the algebraic identity ( ) ( ) ( ) = = = = = - + - = - J j n i j ij J j j J j n i ij Y Y Y Y n Y Y 1 1 2 1 2 1 1 2 4.6 The American Car Company is interested in the average number of cars coming off three assembly lines with obvious defects (determined by visual inspection). The number of defects per week for each of the assembly lines is recorded for several weeks. The data follow. Assembly Line 1 2 3 49 61 55 67 48 50 68 57 64 73 66 56 61 44 53 47 58 49 Given the observations above, test for differences in the mean number of visually defective cars coming off the assembly lines using the F test.

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4.9 A transportation analyst wishes to compare the “degree of support” for a new rapid transit system among the following three groups of people in the Madison, Wisconsin, area: group A, University of Wisconsin faculty; group B, downtown businessmen; and group C, state government personnel. A questionnaire was
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HW #2 - STAT 420 Homework#2(10 points(due Friday February 2...

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