NO.PZ201709270100000306
问题如下：
6. Based on Exhibit 1, Varden’s best answer to Quinni’s question about the F-statistic is:
选项： both independent variables are significant at the 0.05
level.
neither independent variable is significant at the 0.05 level.
C.at least one independent variable is significant at the 0.05 level.
解释：
C is correct. Exhibit 1 indicates that the F-statistic of 4.161 is significant at the 0.05 level. A significant F-statistic means at least one of the independent variables is significant.
老师您好，有点记不清了，有两个问题：
1）这里的 at 0.05 level指的到底是单尾5%（置信区间90%），还是双尾5%（单尾2.5%，置信区间95%）？
2）如果是指单尾5%那可以直接用0.05和F-significance比较，如果是双尾5%是不是就要用0.025和F-significance比较？
谢谢
