# Categorical Data

Pie Charts

Bar Graphs

Comparative Bar Graphs

Relative Frequency Bar Graphs

# Numerical Data (Discrete)

Dot Plots

Stem (and leaf) plots

# Numerical Data (Continuous)

Histogram

# Numerical Data (Cumulative Frequency Plots)

Frequency Polygon

Ogive Plot

# Stem Plots to Compare Two Groups of Data

Compare the distribution pulse rate before and after administering a new drug

- After

Skewed right

An outlier at 146

Centered around 95

Spread between 86 and 146

Range of 60

Before

Skew right

No outliers

Lower center at around 70

Spread between 68 to 110

Smaller range of 42

# Describe the Distribution

Shape (only for numerical data)

# Examples

Make a stem plot of the ages in a college classroom 18, 18, 17, 21, 26, 40, 23

Use your calculator to make a histogram of ages in a college classroom 18, 18, 17, 21, 26, 40, 23, 27, 22, 19, 20, 21, 18, 35, 32

- STAT ➡️ EDIT ➡️ Enter & Type in the data

STAT PLOT (2ND + Y=) Turn on & Select the type

Zoom + 9

TRACE

Describe the distribution of the graph above

- skew right

Students took a statistic quiz. The score for the quiz are below. Describe the distribution of the quiz scores

Slightly skewed left

No outliers

Centered around 42

Spread of 8 to 50

Here are the IQ test scores of a few students. Make a stem plot of these scores.

145 139 126 122 125 130 96 110 120 143

You are interested in how students in your class get to school in the morning. You take a survey and collect the following data:

Car 15, Bus 3, Walk 5, Bicycle 8, Skateboard 1

Construct a bar graph of your data

Construct a relative frequency bar graph