问题如下：
2.Using F-statistic for testing the null hypothesis that all of the independent variables are simultaneously equal to zero at the 5% significance level, the result is :
选项：
A.fail to reject the null hypothesis because the F-statistic is smaller than the critical F-value of 3.19.
B.reject the null hypothesis because the F-statistic is larger than the critical F-value of 3.19.
C.reject the null hypothesis because the F-statistic is larger than the critical F-value of 2.66.
D.fail to reject the null hypothesis because the F-statistic is smaller than the critical F-value of 2.66.
解释：
C is correct.
考点：多元回归分析
解析：ESS= 233.1 - 75.2 = 157.9, F值等于 (157.9/3) / (75.2/176) = 123.2. F统计表里单尾5%自由度3和176的值是2.66,，123.2＞2.66，所以自变量系数都等于零的原假设被拒绝。
问一下关于F分布查表的问题：分布表的横轴是统计量分子的自由度，纵轴是分母的自由度。这道题F-statisic公式应该是n-k-1（即176）是横轴，k（即3）是纵轴啊（尽管这道题分布表已经给出3是纵轴，176是横轴）
