M8: Categorical Data

Question 1

Graphs for categorical data

Answer 1

a) Pie charts
b) Bar graphs

Question 2

Tool for association between two categorical variables

Answer 2

Contingency tables
a) Both explanatory / responsive are categorical
b) Display counts on the table
c) Compute % to determine association

Question 3

How to use conditional proportions in contingency tables

Answer 3

Proportion in responsive variable / Total of explanatory variable

Question 4

Simpson’s Paradox

Answer 4

The direction of an association between two categorical variables can be reversed if we include a third variable and re-analyze the data

Question 5

Relative Risk

Answer 5

Ratio of two proportions