Alternative Hypothesis
Decision rule
- Tells us precisely when H0 should be rejected
- Species when a sample mean is a rare outcome
Decision Rule
' For our electric IQ example:
-If the z score for the sample mean is greater than 1.96 or
less than -1.96, r

If He is false and there is a LARGE effect. . .
* The hypothesized and true distributions don't overlap much
lf H{3 is false and there is 3 LARGE effect . . .
* The probability of a Type ll error is small
*- Type ll error
-Retaining a false null hypothes

Two-Tailed Test
- Directional test
- Uppertail critical; lower-tail critical
One-Tailed Test
' Upper tail critical: *- For a one-tailed test, if the sample mean falls in the direction
that you predict (Upper or lower tail),
-the probability that you rejec