exam 2 notes - TypesofHypotheses HO OF DIFFERENCES

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Types of Hypotheses HO OF DIFFERENCES nominal/discrete/categorical chi square/t test/anova Nondirectional – indicates there is a difference, but we don’t know where Null HO – there is no difference 2-tail test (more conservative – critical region is shrunk) Directional – indicates where the difference exists 1-tail test (more liberal – easier to find differences) .05 = p-value/statistical significance 95% confident the smaller p-value, the less error (greater confidence) IV = sex (2 groups/levels/categories) DV = gpa Nondirectional HO = there is a difference btwn avg m/f gpa’s Directional – indicates where the difference exists Women will have higher gpa’s than men IV = ethnicity DV = # of car accidents Null HO = there is no difference between ethnicity and car accidents Nondirectional – there is a difference between ethnicity and car accidents Directional – Asian drivers have more accidents than other groups
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HO OF RELATIONSHIPS (CO-VARIATION) interval/ratio level Positive – IV and DV move in the same direction The more hours you study, the more you gpa will increase Negative – IV and DV move in opposite direction The more hours your party, the more your gpa will decrease Criteria for a good hypothesis Need at least 2 variables
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exam 2 notes - TypesofHypotheses HO OF DIFFERENCES

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