PSY201H1 Lecture Notes - Lecture 7: Variance, Statistical Hypothesis Testing, Analysis Of Variance
4 Nov 2016
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Lecture 7 (november 1, 2016): analysis of variance. Assumptions of the related samples t test: observations (scores) within each treatment are independent. Participant a isn"t somehow affecting the scores coming from participant. Scores across treatments are not independent and that"s fine: population distribution of difference scores (d values) is normally distributed. If sample is large (30 or more), this assumption doesn"t matter. Need to know which t test to use given any research study/data set. Clicker question: standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. In the 1950s, the average score on the child manifest anxiety scale was 15. 1. A sample of n = 16 of today"s children produces a mean score of 23. 2, with ss = 240: single sample (answer) When you have a value to compare your mean score to (15. 1) it"s a single sample.
