问题如下：
Whisky wants to investigate that whether variable A and B have a linear relationship with variable C, and variable A and B are independent variables, variable C is dependent variable. He does the multiple regression analysis and gets the following results:
If n is 51, which of the following conclusions is most likely correct?
选项：
A.Both A and B are significant at the 0.1 level.
B.A is significant at the 0.1 level.
C.B is significant at the 0.1 level.
解释：
B is correct.
考点: Regression Coefficient: T-test.
解析: 这道题可以直接通过比较P-value和α的值来判断是否significant。当P-value小于α时，我们拒绝原假设，此时变量是significant的。在这题中，只有变量A符合条件，所以A is significant at the 0.1 level。选择B选项。
这道题是不是可以简单来看，因为sample size是150，很大了。所以会近似正太分布Z表，0.1Level，就是90%，所以检验值就应该近似1.65，现在B是接近，而C是小于，所以就肯定是B了。这样理解对吗？
