# 问道MULTIPLE REGRESSION的题-经管之家官网！

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Graham regresses variable Y on four independent variables:X1, X2, X3 and
X4.He obtains the following output:

Graham also tries a regression of Y against X1 and obtains the following
results:

a) Why do you think there is not a big difference between the R-Square of
the two regressions?
b) Graham plots the variable X1 against the variable X2 and obtains the
following graph.What do you think this means?How does it affect the
regression?

c) Would you conclude that there is no significant relationship between Y
and X2?
d) Which of the two regressions would you use to predict Y?
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