11-24-08

# - Psychology 206 Class Notes DUE MONDAY NOTHING DOWNLOAD OFF OF SAKAI Exercise 27 FA 08 Key Old Quiz#3 prepare for Quiz#3 POWER The probability

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Psychology 206 – Class Notes – 11/24/08 DUE MONDAY: NOTHING! DOWNLOAD OFF OF SAKAI: - Exercise 27 FA 08 Key - “Old” Quiz #3 prepare for Quiz #3 POWER The probability that we will reject the null hypothesis when it actually is false Power = (1 – Beta) Type II error + Power = 1 We want POWER o Design the study to have POWER Larger N smaller standard error Strong manipulation Less variability (smaller sigma) smaller standard error o Choose a POWERFUL statistical test Parametric versus nonparametric Parametric statistics are MORE POWERFUL than nonparametric statistical tests Alpha set to .05 (as opposed to .01) Z = (M – u) / (standard error of the sampling distribution) When Z is bigger, you have greater power Z-stat. is bigger when: o (M – u) is bigger (bigger is better) o (standard error of the sampling distribution) is smaller (smaller is better) o When Z-stat is bigger, there is a better chance that you will have statistically

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## This note was uploaded on 06/03/2009 for the course PSYCH 206 taught by Professor Kenney-benson during the Fall '07 term at Allegheny.

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- Psychology 206 Class Notes DUE MONDAY NOTHING DOWNLOAD OFF OF SAKAI Exercise 27 FA 08 Key Old Quiz#3 prepare for Quiz#3 POWER The probability

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