Scatter Plots

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ScatterPlots.notebook

September 20, 2009 Integrated Algebra 09/21/09 Mr. Callahan

AIM:  How do we create scatter plot graphs?

Do Now: Graph the following points:   1) (6, 4)       2) (­5, 1)       3) (2.5, ­5)

Integrated Algebra 09/21/09 Mr. Callahan

AIM:  How do we create scatter plot graphs?

A Scatter Plot is a graph that relates two groups of data.  To  make a scatter plot, plot the two groups of data as ordered pairs.   Data are usually positive, so most plots are in quadrant I.

Hours 

Hours 

Watched   Test Score Watched

Test Score

0 0 0.5 1 1 1 1.5

92 100 89 82 90 95 85

2 2.5 2.5 3 3.5 4 4.5

80 65 70 68 60 65 55

2

70

5

60

100

Test Score

Let's make a scatter plot of  hours of TV watched versus  test scores ­ what can you  say about the results?

80 60 50

40

20

1

2

3

4

5

Hours Spent Watching Television 1

ScatterPlots.notebook

September 20, 2009 Integrated Algebra 09/21/09 Mr. Callahan

AIM:  How do we create scatter plot graphs? Year Daily Newspaper Circulation (millions)

1950 1960 1970 1980 1990 2000 54

  59

  62

   62    62    55

  4

  46

  59

  76

Example 1 Households With Television (millions)

   92    101

Use the data table above to make  a scatter plot of newspaper  circulation versus number of  televisions in households:

AIM:  How do we create scatter plot graphs?

Integrated Algebra 09/21/09 Mr. Callahan

We can use scatter plots to find trends in data.  There are  three types of relationships sets of data may have:

0

0

Positive Correlation

Negative Correlation Generally, one set of data  increases while the other  decreases.

Both sets are generally  increasing together.

0 No Correlation Sometimes data sets are  NOT related.

2

ScatterPlots.notebook

September 20, 2009

AIM:  How do we create scatter plot graphs?

Integrated Algebra 09/21/09 Mr. Callahan

0 A Trend Line on a scatter plot  shows a correlation more clearly.

3

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