Week 2 Summarizing Categorical Data

Question 1

Numeric summary
____
Rows can be ____/____

Answer 1

Numeric summary
Table
rows can be: /counts or relative frequencies (proportion of the total # of individuals)

Question 2

Visual summary
____ (graph name)
(Two graph properties)
Vs histogram

Shows ____

____ (graph name)
Show ____

Answer 2

Visual summary
Bar plot/bar charts
x-axis: categories (ordered if ordinal, anyway if nominal)
y-axis: frequency (counts)/relative frequencies

Note: different from histogram because the x-axis does not make any numerical sense and the bars don’t touch.

Show the exact count or relative frequency allowing for a clear comparison between categories.

Pie charts

Emphasizes relative frequency, but doesn’t show exact number, making it difficult for clear comparison.

Question 3

Interpreting data
Talk about ____ .

Answer 3

Talk about the measurements and trend of categories with the most/least counts/relative frequency.
(talk about the measurements of the second most/least and the trend of their sum with the most/least if they are similar to the most/least)