PSYC*2120 Study Guide - Final Guide: Sample Size Determination, Statistical Hypothesis Testing, Null Hypothesis
Document Summary
Size of mean difference: the larger this difference, the larger the z score will be, the larger the difference, the more evidence there is of a true treatment effect. Variability of the scores: high variability. Make it more difficult to see a pattern in the results. Sample size: larger the sample, the more information there is so more convincing the results, the larger the sample size, the more likely it is to reject the ho. Significance level alpha: larger alpha level the critical value will be smaller and closer to the population mean. Sample appears to show evidence of a treatment effect, when in fact the treatment has no effect. Researcher concludes that a treatment has an effect when in fact it does not have an effect. Risk of type 1 error is small and is under the control of the researcher. Is equal to the proportion of alpha.
