7th Grade Math

546 Statistical Displays

Chapter Study

Guide and Review

Key Concepts

Measures of Central Tendency (Lesson 1)

• Measures of central tendency are numbers that
  describe the center of a data set. They are mean,
  median, and mode.

Measures of Variation (Lesson 2)

• Measures of variation are used to describe the
  distribution of a data set.


• The range is the difference between the greatest
  and the least numbers in the set.


• Box-and-whisker plots use a number line to show
  the distribution of a set of data.

Statistical Displays (Lesson 3)

• A circle graph shows data as parts of a whole.


• A histogram displays numerical data organized
  into equal intervals.


• A stem-and–leaf plot lists individual numerical
  data in a condensed form.

More Statistical Displays (Lesson 4)

• Scatter plots show a relationship between a set of
  data with two variables.

Key Vocabulary

box-and-whisker plot

circle graph

histogram

interquartile range

line of best fit

lower quartile

mean

measures of central

tendency

measures of variation

median

mode

outlier

quartiles

range

scatter plot

stem-and-leaf plot

Vocabulary Check

State whether each sentence is true or false.

If false, replace the underlined word or

number to make a true sentence.

1. The range is the difference between the
   greatest and the least values in a set
   of data.


2. The mode divides a set of data in half.


3. The interquartile range is one of the
   measures of central tendency.


4. A(n) scatter plot shows a relationship
   between a set of data with two variables.


5. The median of the bottom half of a data set
   is the lower quartile.


6. The mean is the arithmetic average of a set
   of data.


7. The number or item that appears most
   often in a set of data is the mode.


8. The range is the middle number of the
   ordered data, or the mean of the middle
   two numbers.


9. A(n) variation is a piece of data that is
   more than 1.5 times the value of the
   interquartile range beyond the quartiles.

Be sure the following

Key Concepts are noted

in your Foldable.

Histograms

Stem and

Scatter

Plots

AppropriateSelect an

PloPlPlPPPloloo Display

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