b. That the percentage of the variation in sales that is shared with the variation in advertising is about 64%.
Coefficient of Determination = R2 = 0.802 = 0.64 = 64%
a. Change the perceived slope and not the correlation.
If the points are stretched out horizontally or vertically, the slope changes but the correlation does not change.
a. The sample correlation coefficient remains unchanged at 0.64.
Correlation coefficient is independent of change of origin and scale.
d. All of above
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