标题: quant: sample exam: two tail test and 95% significance [打印本页] 作者: former 时间: 2011-7-13 16:09 标题: quant: sample exam: two tail test and 95% significance
the question about "
exhibit 2 and two tail t-test to deterine if the coefficients are equal to zero, at the 0.05 significance level, ....
is it is at 0.05 significance level should we also accept Hull hyp for intercept=0? as its p-value >0.025? Thanks.作者: Kapie 时间: 2011-7-13 16:09
i was actually a little bit confused about the solution too. I would use p-value < 0.025 for 95% CI 2-tail, but CFAI used p < 0.05作者: bdavi77962 时间: 2011-7-13 16:09
p-value is to be compared to alpha (level of significance)....if it's a 5% signficance level, p-value needs to <0.05
two tail tests simply have alpha/2 on each tail...but p-value is still compared to alpha作者: llxx 时间: 2011-7-13 16:09
If you look at the table, a one sided at 95 gives the same t value as a two sided at 90.
For this reason, the p-value for a one sided 5% sig will never be the same as a two-sided at 5% sig.
Edited 1 time(s). Last edit at Thursday, June 2, 2011 at 11:16AM by CFA_Chap.作者: flyinggirl 时间: 2011-7-13 16:09
so for a two tailed test, if it is 5% significance level, and p-value is 0.04, than reject Ho?
or if p-value is 0.015, then we could reject H0?
which value p-value should compare against ? 5% or 2.5% in two tail test? Thanks.
MFIN--- Wrote:
-------------------------------------------------------
> p-value is to be compared to alpha (level of
> significance)....if it's a 5% signficance level,
> p-value needs to <0.05
>
> two tail tests simply have alpha/2 on each
> tail...but p-value is still compared to alpha作者: tikfed 时间: 2011-7-13 16:09
good question.. i guess we apply p less than <0.025 ... can anyone confirm?作者: bingbingliang 时间: 2011-7-13 16:09
the cfai sample used p<0.05 for a 95% CI, 2 tail. is this wrong?作者: SpyAli 时间: 2011-7-13 16:09
except you likely wouldn't be testing the intercept?
not sure if I agree with your post... but i think you get the basic idea作者: RepoToronto 时间: 2011-7-13 16:09
double checked with 2 economics major students, we look at p < 0.05 even if its 2 tail.作者: wilslm 时间: 2011-7-13 16:10
