Displaying Data

Question 1

Frequency table

Answer 1

Usually used for categorical data (but can also be used for numeric)
Organized by Pareto ordering

Question 2

Pareto ordering

Answer 2

Starting with the most frequent item and then going down

Catch-all category should be at the bottom regardless of frequency

Question 3

Pie chart

Answer 3

Useful for conveying relative frequency

Usually used for categorical data (but can also be used for numeric)

Question 4

Bar chart

Answer 4

Conveying ordinal or nominal data
Pareto ordering not used (wouldn’t make sense!)
Shows each entry separately

Question 5

Dot plots

Answer 5

Each dot represents a response

Useful only for small sets of numeric data

Question 6

Stem-and-leaf plots

Answer 6

Small numeric data sets
Left column: tens or hundreds, etc.
Right column: ones place
Each number in right column represents 1 response

Question 7

Histogram

Answer 7

Similar to bar chart, but for numeric data only

Can display ranges of data

Question 8

Things needed when describing a distribution

Answer 8

Shape
Modes
Skew
Outliers

Question 9

Poisson shape

Answer 9

Max is at beginning and drops off

Question 10

U shape

Answer 10

Opposite of bell curve (looks like a U)

Question 11

J shape

Answer 11

Opposite of Poisson

Max is at end and drops off to right (similar to exponential curve)

Question 12

Naming skew

Answer 12

Always named for tail (where the data trails off; opposite of where max is)

Question 13

Describing nominal data

Answer 13

State mode

Explain dispersion of data (can’t use mean, range, etc.)