nTest for **ANY **difference
between means? - Two-tail

nTest < or > between means? - One-tail

n1. Rejection region
- distribution above the critical value

n2. Errors

n**Type I **- rejecting
true H0

n**Type II **- accepting false H0

n**3. **Level of significance (*α*) - probability of making Type
I

n4**.** Power of
statistical test (1 - *β*)** **- probability of making

the correct
decision to reject false null