PSY 201 Lecture Notes - Lecture 3: Analysis Of Variance, Variance, Type I And Type Ii Errors
21 Nov 2016
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The hypothesis-testing process: restate the question as a research hypothesis and a null hypothesis. Research hypothesis: this child has a disorder. Null hypothesis: this child is normal: determine the characteristics of the comparison distribution. Comparison distribution= frequency of occurrence f symptoms among non-disordered children. E. g. , in population of non-disordered children, assume mean=2 and standard deviation=. 85. So the null hypothesis is that the child in your office comes from this distribution: determine the cutoff sample score on the comparison distribution at which the null hypothesis should be rejected. Conventional level of significance: p 1. 96, so reject null hypothesis. If we mistakenly conclude they do (we mistakenly reject ho: assume child does not have more psychiatric symptoms than normal, probability set at alpha, usually at . 05. Therefore, probability of type i error = . 05.
