Psych 100A
Winter 2010
Lecture 11: Power Analysis &
Statistical Inference (cont.)
1.Relationships among
, power and
n
2.Power curves
3.Confidence intervals for
when
2
is unknown
4.Properties of the t-distribution
5
Finding areas in t
distribution
5.Finding areas in t-distribution
1

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Power – Probability of rejecting null hypothesis
when a specified alternative hypothesis is true.
Power = Area under the alternative distribution curve’s
tail. If the alternative distribution mean is less than the
null distribution mean then it is the left tail.
2

Directional z-test
3

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