96-97 / 1676
96-97 / 1676
Statistical power
•
Example: Two sample t-test
•
Procedure for test
•
Verify normal distribution
•
Verify same variance in the two samples
•
Calculate test statistic
t
=
x
1
-
x
2
s
1
2
( 1
n
1
+
1
n
2
)
Sample estimate of variance, σ
2
