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Cross-tabulations and Banners
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Cross-tabulation Way to organize data by groups or categories, thus facilitating comparisons; joint frequency distribution of observations on two or more sets of variables Contingency table: Result of cross- tabulating two variables, such as survey questions Relative to univariate analyses, bivariate analyses can provide more insights
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Example #1
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Example #2
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Looking for Differences Between Groups
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Type of Measurement Differences between two independent groups Nominal Chi-square test When Chi-square Test Appropriate
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MenWomenTotal Aware 50 10 60 Unaware 15 25 40 65 35 100 Awareness of Tire Manufacturer’s Brand Question: Do men differ from women in their awareness? Example #3
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Chi-Square Test x² = chi-square statistics O i = observed frequency in the i th cell E i = expected frequency on the i th cell
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R i = total observed frequency in the i th row C j = total observed frequency in the j th column n = sample size Chi-Square Test
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d.f.=(R-1)(C-1) Degrees of Freedom
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Chi-Square Test
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Elaboration and Refinement Moderator variable –Third variable that alters or has a contingent effect on the relationship between an independent variable and a dependent variable –Spurious relationship An apparent relationship between two variables that is not authentic
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Tworatingscales 4 quadrants two-dimensionaltable Importance-PerformanceAnalysis) Quadrant Analysis
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