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Fig. 7.4
Regression SUMMARY OUTPUT of SAT vs. FROSH GPA Data

WRITING SCORES, AND MATH SCORES together form a very strong positive

relationship in predicting FROSH GPA.

To ﬁnd the regression equation,
notice the coefﬁcients at the bottom of the

SUMMARY OUTPUT
:

Intercept: a (this is the y-intercept)

1.5363

READING SCORE: b
1

0.0006

WRITING SCORE: b
2

0.0003

MATH SCORE:

b
3

0.0021

Since the general form of the multiple regression equation is:

Y

a

b
1
X
1
þ

b
2
X
2
þ

b
3
X
3

(7.2)

¼

þ

we can now write the multiple regression equation for these data:

Y

1.5363 + 0.0006 X
1
+ 0.0003 X
2
+ 0.0021X
3

¼

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