Microsoft Office Tutorials and References
In Depth Information
Create an Excel spreadsheet for these data using the following cell reference:
A2: SAT REASONING TEST
A4: Is there a relationship between SAT scores and Freshman GPA at a local
college?
A6: FROSH GPA
A7: 2.55
C6: WRITING SCORE
D6: MATH SCORE
D17: 660
Next, change the column width to match the above table, and change all GPA
ﬁgures to number format (two decimal places).
Now, ﬁll in the additional data in the chart such that:
A17:
3.65
B17:
440
C17:
570
Then, center all numbers in your table
Important note:
Be sure to double-check all of your numbers in your table to be
sure
that
they
are
correct,
or
your
will
be
incorrect.
Save this ﬁle as: GPA15
Before we do the multiple regression analysis, we need to try to make one
important point very clear:
Important:
When we used one predictor, X, to predict one criterion, Y, we said
that you need to make sure that the X variable is ON THE LEFT in
your table, and the Y variable is ON THE RIGHT in your table so
that you don’t get these variables mixed up (see Sect. 6.3 ) .
However, in multiple regression, you need to follow this rule which is exactly
the opposite:
When you use several predictors in multiple regression, it is
essential that the criterion you are trying to predict, Y, be ON THE
FAR LEFT, and all of the predictors are TO THE RIGHT of the
criterion, Y, in your table so that you know which variable is the
criterion, Y, and which variables are the predictors. If you make this
a habit, you will save yourself a lot of grief.
Notice in the table above, that the criterion Y (FROSH GPA) is on the far left of
the table, and the three predictors (READING SCORE, WRITING SCORE, and
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