Quantitative Methods 2017

x

- x 2

1

t =

Statistical power

+ 1 n 2

2 ( 1 n 1

s 1

)

• The larger the effect size, the better • The smaller the variance, the better

Easy

Hard

x

-x

=7, s

=1.5

x

-x

=2, s

=1.5

1

2

1

1

2

1