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.
Is the relationship between the ratio of cash flow to operations and the ratio of net income to sales significant at the 5 percent level?
选项：
A.No, because the R-squared is greater than 0.05.
B.No, because the p-values of the intercept and slope are less than 0.05.
C.Yes, because the p-values for F and t for the slope coefficient are less than 0.05.
解释：
C is correct.
The p-value reflects the strength of the relationship between the two variables. In this case the p-value is less than 0.05, and thus the regression of the ratio of cash flow fromoperations to sales on the ratio of net income to sales is significant at the 5 percent level.
这道题为什么不用F检验？
