Investigating Associations Between Categorical Variables (VCE SSCE General Mathematics): Flashcards
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Association between variables
Association between variables
When two variables are related or connected
Two-way frequency table
Two-way frequency table
Summarises data from two categorical variables together
Explanatory variable (EV)
Explanatory variable (EV)
Variable that might explain or influence the other
Response variable (RV)
Response variable (RV)
Variable influenced by the explanatory variable
Table layout: RV and EV placement
Table layout: RV and EV placement
RV labels rows, EV labels columns
Calculating column percentages
Calculating column percentages
Cell frequency ÷ column sum × 100
Evidence of association
Evidence of association
Row percentages differ substantially between columns
Similar percentages indicate
Similar percentages indicate
No association between the variables
Segmented bar chart
Segmented bar chart
Visual of percentaged two-way table, bars reach 100%
Why use percentages?
Why use percentages?
Allows fair comparison when group sizes differ