H₀ mean μ₀
True mean μ₁
SD σ
sample size n
alpha α
tails
one-tailed: μ₁ > μ₀
one-tailed: μ₁ < μ₀
two-tailed
H₀ true
H₀ false
Reject H₀
Type I error
Power
Fail to reject H₀
Correct
Type II error