Common Hypotheses
H0 : µ = µ0 Ha : µ ≠ µ0
H0 : µ = µ0 Ha : µ < µ0
H0 : µ = µ0 Ha : µ > µ0
Assumptions
Sample are randomly selected or a randomized experiment.
Sampling with replacement (or sample size < 10% N)
If the observed distribution is skewed, n should be greater than 30.
If the sample size is less than 30, the distribution of the sample data should be free from strong skewness and outliers.
Sampling Distribution
Student's t (if σ unknown)
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