C
Chandrima
Member
Can anyone explain which test they are applying in finding out the 95% confidence interval for this sum? I used test statistic (beta cap - beta)/Se(beta) follows t(n-2) and my 95% C.I. is coming as (0.4319, 1.5317). But in solution, they used some t(n-2),alpha/2 which I'm not being able to understand! Will appreciate if anybody helps me understanding their solution.