问题如下图:
选项:
A.
B.
C.
解释:
significant at xxx这种说法表示拒绝还是不拒绝原假设?NO.PZ2018101001000012 Intercept Coefficient is not significant the 5% level. X is significant the 5% level. C is correct. 考点: Regression Coefficient: T-test. 解析: 当=n-2=50 α=5%时, 查表可得, 此时的分界点为2.009,均小于intercept和X的t-Statistic,所以both X anintercept coefficient are significant the 5% level,C正确,B错误。由表可知,slope即X的coefficient为4.5698,为positive,所以X ha positive influenon Y,A错误。老师可否总结下自由度使用规律,已经被n n-1 n-k-1搞晕掉了
NO.PZ2018101001000012 Intercept Coefficient is not significant the 5% level. X is significant the 5% level. C is correct. 考点: Regression Coefficient: T-test. 解析: 当=n-2=50 α=5%时, 查表可得, 此时的分界点为2.009,均小于intercept和X的t-Statistic,所以both X anintercept coefficient are significant the 5% level,C正确,B错误。由表可知,slope即X的coefficient为4.5698,为positive,所以X ha positive influenon Y,A错误。老师,表在哪里看,题干一般不给吗?
NO.PZ2018101001000012 1.t检验一般查表都是按双尾的吗 2.截距的自由度和x1的自由度都一样是n-k-1吗
老师,这道题置信区间不是4.5698土1.96*1.2987=(2.0243, 7.115)么?那么T统计量很明显在接受域呀,应该是not significant,C怎么能对呢?
视频里老师不是说表格中的t检验值是按原假设为0给的吗,答案怎么把查表得的临界值直接和表格里的t值比较了呢?