PSYC 2920 Study Guide - Quiz Guide: Sample Size Determination, Effect Size, Sampling Distribution
2 Dec 2016
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Document Summary
Inferential statistics: statistics that enable us to state whether the results we observed in our sample/study reflect the true situation in the population. Statistical significance: when the researcher concludes that the observed difference in the population (not the result of sampling error/chance) Hypothesis testing: formal method of examining whether a proposed relationship between two variable is true. Null hypothesis: mean of two populations are the same (no effect on the independent variable) Research (alternative) hypothesis: the means of the two populations are not the same (effect is present) Sample distribution: a theoretical frequency distribution of a statistic based on a large number of samples drawn at random from a population when the null is true. Frequency distribution can tell us the probability of randomly sampling specific ranges of scores. Sample distribution is used to assess the probability of our observed results when the null is true.
