Suppose that ahospital's managementis interested in predicting the total bill (y in $1,000) based on a patient's age (x

1

x1), length of stay (x

2

x2), and the number of days in intensive care unit (ICU) (x

3

x3). Suppose that he or she got the followingpartial output of a minitab regression analysis.

PredictorCoefSE Coef

Constant0.6081.258

x

1

x1

0.029800.02878

x

2

x2

1.28060.2493

x

3

x3

3 .11.214

Analysis of Variance

SourceDFSS

Regression3701.39

Residual Error37348.57

Total401049.96

At significance level=.05

=.05we would keep the following model

Select one:

y

^

=.608+3.1x

3

+9.61x

2

3

y^=.608+3.1x3+9.61x32

y

^

=.029x

1

+1.28x

2

y^=.029x1+1.28x2

y

^

=1.28x

2

+3.1x

3

y^=1.28x2+3.1x3

y

^

=.029x

1

+1.28x

2

+3.1x

3