NO.PZ201904080100008002
问题如下：
2. Are the intercept term and the slope coefficient statistically significantly different from zero at the 5% significance level?
Give the t-critical values as follow:
the t-critical values are all two-tails
选项：
Intercept term significant?
Slope coefficient significant?
Yes
No
No
No
No
Yes
Yes
Yes
解释：
C is correct
考点：Hypothesis Test in Linear Regression
解析：因为是48个月的数据，所以n=48，所以本题应该去查双尾95%的df=48-2=46的数据，即 the critical two-tailed 95% t-value = 2.013.
截距项的 t检验值=0.0053/0.0042=1.262<2.013，斜率项的t检验值=1.5863/0.0744=21.32>2.013 所以，截距项不显著，斜率项显著
1）因为是linear relationship，所以是n-2的自由度是吗？
2）significant 是不是means， we reject H0？
