S5. T-distributions
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5 Terms
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Student T-distributions
Bell-shaped, symmetric, uni-modal, used when population s.d. is unknown.
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T-distribution equation
t = (m - µ) / (e.s.e.)
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T-distribution critical values table
look at 1 or 2 tailed 0.05 value, and v value (which is N-1)
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Confidence intervals with T-distribution
Pre: m - (c x s/ √N). Post: m + (c x s/ √N). (c = t-distribution critical value from tables).
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1 sample t-test
1. Hypothesis. 2. Data. 3. Evaluate inconsistency with H0. 4. Reject/fail to reject. 4. Interpret
Note 
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