The Basic Practice of Statistics
The Basic Practice of Statistics
8th Edition
ISBN: 9781319042578
Author: David S. Moore, William I. Notz, Michael A. Fligner
Publisher: W. H. Freeman
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Chapter 29.9, Problem 25AYK

a.

To determine

To construct: A simple linear regression equation for predicting tuition fees from years and also show the residuals and fitted values.

b.

To determine

To estimate: The tuition fee for the year 1971 using the estimated regression equation.

c.

To determine

To check: Whether the estimate obtained in part (b) is meaningful.

d.

To determine

To plot: The residuals against the year.

To explain: The inadequacy of fitting a linear model.

e.

To determine

To identify: Whether the linear model underestimate or overestimate the tuition fee during 1990s.

f.

To determine

To construct: A quadratic regression model for estimating the tuition fees using year as explanatory variables.

g.

To determine

To check: Whether the quadratic model provides a better fit than linear model.

h.

To determine

To state: Whether the experimenter will be interested to give inferences based on quadratic regression model.

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