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Linear regression

A linear regression between Y and X produced the following equation for the least squares line:
= -4.13 + 2.1x
Which of the following statements concerning this relationship is true?
a.For every one-unit increase in X, Y increases 4.13 units.
b.For every one-unit increase in X, Y decreases 2.1 units.
c.For every one-unit increase in X, Y decreases 4.13 units.
d.For every one-unit increase in X, Y increases 2.1 units.

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