A government agency pays research contractors a fee to cover overhead costs, over and above the direct costs of a

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A government agency pays research contractors a fee to cover overhead costs, over and above the direct costs of a research project. Although overhead costs vary considerably among contracts, they are usually a substantial share of the total contract cost. An agency task force obtained data on overhead costs are a percentage of direct costs, number of employees of the contractor, size of contract as a percentage of the contractor€™s yearly income, and personnel costs as a percentage of direct costs. The data are given below for the 86 research contractors as follows: contractor, overhead costs as a percentage of direct costs, number of employees, size of contract, and personnel costs as a percentage of direct costs.

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a. Obtain correlations of all pairs of variables. Is there a severe collinearity problem with the data?
b. Plot overhead costs against each of the other variables. Locate a possible high influence outlier.
c. Obtain a regression equation (with overhead costs as the dependent variable) using all the data including any potential outlier.
d. Delete the potential outlier, and get a revised regression equation. How much did the slopes change?

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The Minitab Output is given here Correlations OVERCOST NUMEMPL SIZE PERSCOST MODEL WITH OUTLIER Regr…View the full answer

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Related Book For answer-question

An Introduction To Statistical Methods And Data Analysis

ISBN: 9781305465527

7th Edition

Authors: R. Lyman Ott, Micheal T. Longnecker

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Question Posted: November 21, 2015 01:53:27

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