Final_Review

Final_Review - Psych 100A Final Review Session Notes Dawn Chen December 8 2009 How to Decide What Type of Hypothesis Test to Use Test One-sample

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Psych 100A Final Review Session Notes Dawn Chen December 8, 2009 How to Decide What Type of Hypothesis Test to Use Test When to use this test One-sample z -test You want to compare the scores in your sample to the population average ( ), μ and σ is known One-sample t -test You want to compare the scores in your sample to the population average ( ), and is unknown Independent samples z -test You want to compare the scores of one group to the scores of a separate group, and 1 2 , σ σ are known Independent samples t -test You want to compare the scores of one group to the scores of a separate group, and 1 2 , are unknown but can be assumed to be equal Dependent samples t - test You want to compare two sets of scores for the same group or you want to compare the scores of two related groups Two-tailed (non- directional) test You want to see if there is a difference between the scores of the two groups One-tailed (directional) test You want to see if the scores of one group are higher than (or lower than) the scores of the other group One-factor between- subjects ANOVA You want to compare the scores of three or more separate groups, each of which had or received one level of one independent variable (IV) Two-factor between- subjects ANOVA There are two IVs, and each combination of the levels of one IV with the levels of the other IV is given to a separate group of subjects One-factor within- subjects ANOVA There is one IV with three or more levels, and each level of the IV is given to the same group of subjects Chi-square test for goodness-of-fit There is one nominal dependent variable (DV), and you want to see whether the actual number of observations in each category of the DV matches the expected number of observations for that category Chi-square test of independence There are two nominal variables, and you want to see whether they are related (if certain values of one variable tend to occur with certain values of the other variable)
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For the hypothesis tests that we learned in this class, you can follow the flow chart below to decide which one to use. Each rectangle represents a question you can ask and each oval represents a test you can use. To decide whether it’s a between-subjects or within-subjects design, we look at the wording of the problem. It there is random assignment (subjects are randomly assigned to one of two or more groups), then it’s a between-subjects design. A between-subjects design is one in which each subject gets one treatment or a different treatment (or a third one, and so on), or each subject possesses one characteristic or a different characteristic (e.g. gender, a subject can only
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This note was uploaded on 09/24/2010 for the course STATS 13a taught by Professor Chen during the Spring '10 term at UCLA.

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Final_Review - Psych 100A Final Review Session Notes Dawn Chen December 8 2009 How to Decide What Type of Hypothesis Test to Use Test One-sample

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