NO.PZ2015120204000003
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.
老师您好，
我想问一下我以下的理解是否正确：
1.correlation并不等价于slope，我们只能从slope的正负推断出correlation的正负，但是他们两个具体的值并不相等
2.我想问一下既然slope代表的是X与Y的关系，correlation也代表的是X与Y的关系，为什么他们所代表的具体值不一样
