Section 2.1 Flashcards
One Categorical Variable Summary Statistics: Frequency table, Proportion Visualization: Bar Chart, Pie Chart Two Categorical Variables Summary Statistics: two-way table, difference in proportions Visualization: Segmented or Side-by-Side bar chart (9 cards)
Descriptive Statistics
Summarizing and visualizing variables and relationships between two variables
Frequency Table
Shows the number of cases that fall in each category
Proportion
Proportion in a category is found by:
P = number in category / total sample size
Relative Frequency Table
Shows the proportion of cases that fall in each category
Bar Chart / Plot / Graph
The height of the bar corresponds to the number of cases falling in each category
Pie Chart
In a pie chart, the relative area of each slice of the pie corresponds to the proportion in each category
Two-Way Table
A Frequency table that displays two different categories collected from a single group
Difference in proportions
A difference in proportions for one categorial variable calculated for different levels of the other categorical variable
Side-by-side Chart
The height of each bar is the number of the corresponding cell in the two-way table
