If you have a test at a a=0.01 with a single sample of 40 and the Ha>20.23, a critical value could be approximately?
a. 1.782
b. 1.960
c. 2.330
d. 2.575

I don't really understand what to do at all

So I would look at the t-table and so
v= n-1
but since there is a single sample of 40 does that mean its 0 which is not part of the table. Once i get the t value what do i do?