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Unformatted text preview: Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
1.645 Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
1.645 2. [email protected] standard [email protected] The smaller the populaDon standard deviaDon, the more power you have. This is due to less overlap between the distribuDons (again, easier to ﬁnd an eﬀect) 15 9/29/13 Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
1.645 Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
1.645 3. Sample size The larger the sample size, the more power you have. Larger sample size leads to smaller SD of the distribuDon of means, which leads to: ▪ Less overlap between the distribuDons 16 9/29/13 4. Signiﬁcance level The more stringent the signiﬁcance level (for example, p < .05 vs. p < .01), the less power you have. More stringent p
value, the more extreme the cut
oﬀ score Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
1.645 Shaded region is power Opposite shaded region is beta β Shaded region is alpha PopulaDon 1 PopulaDon 2 Z =
2.33 Z =
1.645 17 9/29/13 5. One
tailed vs. Two
tailed tests One
tailed tests have more power than two
tailed tests. With a one
tailed test, there is a less extreme cut
oﬀ scores on the distribuDon: ▪ More area in the power region 1.
2.
3.
4.
5. Eﬀect size Standard deviaDon Sample size Signiﬁcance level One
vs Two
tailed 18...
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This note was uploaded on 03/24/2014 for the course PSY 21201 taught by Professor Bernard during the Winter '13 term at SUNY Stony Brook.
 Winter '13
 bernard
 Psychology

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