106-107 / 1676
Statistical power
•
The larger the effect size, the better
•
The smaller the variance, the better
t
=
x
1
-
x
2
s
1
2
( 1
n
1
+
1
n
2
)
Easy
Hard
x
1
-x
2
=2, s
1
=1.5
x
1
-x
2
=7, s
1
=1.5
|
|
106-107 / 1676
106-107 / 1676
Statistical power
•
The larger the effect size, the better
•
The smaller the variance, the better
t
=
x
1
-
x
2
s
1
2
( 1
n
1
+
1
n
2
)
Easy
Hard
x
1
-x
2
=2, s
1
=1.5
x
1
-x
2
=7, s
1
=1.5