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Test Statistic equation
t_{s} = (ÿ  µ)/SE

When to Reject
 if t_{s} is between t_{α/2} = fail to reject
 if outside reject

significance level
maximum probability of making a type I error

directional/ sidedness to test
 if alternative ≠ = nondirectional or 2sided
 if < or > = directional or 1sided // put all α on one side

computing prob of type II
 if Alternate fixed = can do it
 if < or > can't

pvalue
 probability t_{s }is at least as extreme is the t_{s} observed
 reject if p < α
 pay attention to sign!!

