PSYC 204 Study Guide - Central Limit Theorem, Simple Random Sample, Stratified Sampling
13 Dec 2013
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Document Summary
Simple random sampling: every population number as an equal probability of being chosen for the sample. Systematic sampling: there is a rule used to choose sample members such that every observation is included. Stratified sampling: the population is divided into subgroups and members of each subgroup are included in the sample. Null hypothesis: the statement that no mean difference exists or that no relationship exists. Alternate hypothesis: the experimental hypothesis that a difference or a relationship exists. Either direction of difference or relationship supports the alternate hypothesis. Only one direction of difference or relationship supports the alternate hypothesis. Type 1 error: a false statement of significance. Type 2 error: failing to find a true difference (relationship) significance. Power of statistical test: ability of a test statistic to detect a true significant result. Effect size: the difference between the means of distributions that represent null and alternate hypotheses.
