NO.PZ2018101001000045
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。
一般来说，就是有两种比较方法，一种是用t检验，就是用第三列的t和critical value进行比较，那这道题中的critical value怎么知道是多少呢？没有给我们表呀？
第二种就是看p-value的值，p-value的值越小越拒绝原假设，这道题里面A的比B的小，但是他们具体是和谁去比较呢？就是那个0.1level吗？就是0.1吗？
那题目中的n=51告诉我们是干嘛用的呀？
不好意思，就是听懂了课，但是题目还不是很会做。
