7th Grade Math

Lesson 4C More Statistical Displays 541

Construct a Display

ETHANOL Select an appropriate type of display to compare the

percent of ethanol production by state. Justify your reasoning.

Then construct the display. What can you conclude from your

display?

Ethanol Production by State Per Year

State Iowa Nebraska Illinois Minnesota Indiana Other

Gallons (millions) 3,534 1,665 1,135 1,102 1,074 5,098

You are asked to compare Ethanol Production by State

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parts to a whole. A circle graph

would be an appropriate

display.

Indiana, Minnesota, and

Illinois produce about the

same amount of ethanol.

b. MUSICALS The table lists the ticket prices Ticket Prices

Year Price ($)

2008 5.00

2009 5.50

2010 6.50

2011 7.00

for school musicals during recent years.

Select an appropriate display to predict

the price of a ticket in 2012. Justify your

reasoning. Then construct the display.

What can you conclude from your display?

Statistical Displays

Type of Display Best Used to...

Bar Graph show the number of items in specific categories

Box-and-Whisker Plot show measures of variation for a set of data; also

useful for very large sets of data

Circle Graph compare parts of the data to the whole

Double Bar Graph compare two sets of categorical data

Double Line Graph compare change over a period of time for two

sets of data

Histogram show frequency of data divided into equal intervals

Line Graph show change over a period of time

Line Plot show frequency of data with a number line

Scatter Plot show the relationship between a set of data with

two variables graphed as ordered pairs

Stem-and-Leaf Plot list all individual numerical data in condensed form

Data Displays Data Displays Many

situations have more than

one appropriate display.

Real-World Link

For every one bushel

of corn, it takes

3–5 days to produce

2.8 gallons of ethanol.

RR

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