2.1 - 2.2 Types of Graphs

Question 1

Define frequency.
Define relative frequency.

Answer 1

*the number of observations for a given value(s) or characteristic
*the number of observations for a given value divided by the total number of observations, written as a proportion or percent

Question 2

Define bar graph. Categorical or numerical variables?
Define side-by-side bar graph. Categorical or numerical variables?

Answer 2

categorical
side-by-side bar graphs involve comparing 2-3 sets of data

Question 3

Define pareto chart. Categorical or numerical variables?

Answer 3

increasing bar graph
categorical

Question 4

Define pie chart. Categorical or numerical variables?

Answer 4

used for percentages of a whole
categorical

Question 5

Define histogram. Cateogrical or numerical variables?

Answer 5

shows frequency of numerical data
numerical

Question 6

Define dot plot. Cateogrical or numerical variables?

Answer 6

numerical

Question 7

Define steam-and-leaf plot. Cateogrical or numerical variables?

Answer 7

numerical

Question 8

Define box and whisker (aka time series) plot. Cateogrical or numerical variables?

Answer 8

numerical

Question 9

What should you look for in graphs of categorical data?

Answer 9

bar graphs, pareto chart, pie chart
*mode (most frequent)
*clusters vs. spread
*irregularities

Question 10

What should you look for in graphs of numerical data?

Answer 10

histogram, dot plot, stem-and-leaf plot, box and whiskers plot
*center
*shape (left-skewed, right-skewed, symmetric)
*variability = spread
*outliers (irregularities)