问题如下：
The independent variable is the ratio of net income to sales for restaurants with a market cap of more than $100 million and the dependent variable is the ratio of cash flow from operations to sales for those restaurants.
What is the correlation between X and Y?
选项：
A.-0.7436.
B.0.7436.
C.0.8623.
解释：
C is correct.
For a regression with one independent variable, the correlation is the same as the Multiple R with the sign of the slope coefficient. Because the slope coefficient is positive, the correlation is 0.8623.
请问coefficient和correlation有什么区别？就是R2和mutiple R如何区分呢
