Solved
Critical value and test statistic
Posted on 2006-11-09
The general population has the mean (5/1000); and the test sample has
(15/5000).
However, we don't know the sd. In this case, how to calculate t value?
If I use the critical-value method with α =0.05, then I come up with
the critical value, -1.645158
My question is how to calculate t value without knowing the sd at all?
The formula is t = (x bar - mu 0) / (sd/sqrt(n)).
so, it could be:
(5/1000 - 15/5000)
--------------------------
sd /sqrt(5000)
thx
ej