PSYC 210 Study Guide - Quiz Guide: Null Hypothesis, Test Statistic, Statistical Hypothesis Testing
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Z table tells us the percentage of scores that fall between the mean and z, or z and the tail. Applicable for z scores and z statistics, depending on the question. Convert the raw score into a z score and find the corresponding percentages. To find the between percentage, subtract their mean to z percent. Z test is an example of parametric tests: assumptions made about the population. Determine the characteristics of the comparison distribution (sd, mean) 1 tail test: 1 cutoff region, . 05 in the known direction (will state higher/lower) She is guessing the direction be higher or lower than the null. 2 tail test: 2 cutoff regions, . 025 in both directions, don"t know the direction. Scores that exceed the cutoff point are statistically significant. P value= 0. 05 (5% for 1 tail) (2. 5% for 2 tailed) Alpha region: area in tail in which the critical value falls (find the corresponding z score)
