1-5: Scatter Plots

Essential Question: How would you explain the process for graphing a point on a coordinate plane?

1-5: Scatter Plots A scatter plot is a graph that relates two

groups of data. Example 1: Making a scatter plot

The table below shows data about how students did on a test and how much homework they watched the previous day.

1 2 3 4 5

20

40

60

80

100

Hours watching TV

Test

Sco

re

1-5: Scatter Plots Your Turn

Use the data in the table below. Make a scatter plot of newspaper circulation and the number of households with television.

20 40 60 80 100

20

40

60

80

100

Daily Circulation (millions)

House

hold

s w

ith

Tele

vis

ion (

mill

ions)

1-5: Scatter Plots You can use scatter plots to find trends in

data. There are four types of relationships two sets of data may have.

When both sets of data increase together, it is considered a positive correlation

When one set of data increases whilethe other decreases, it is called anegative correlation

1-5: Scatter Plots You can use scatter plots to find trends in

data. There are four types of relationships two sets of data may have.

Sometimes, data sets are not relatedThis is no correlation

Undefined correlation occurswhen one set of data shows nochange

1-5: Scatter Plots A trend line on a scatter plot can show

correlations more clearly.

1-5: Scatter Plots Example 2: The scatter plot shows the age

and asking price of several used mid-sized cars. What type of relationship does the scatter plot show?

a) A negative correlation

b) No correlation

c) An undefined correlation

d) A positive correlation

1-5: Scatter Plots Assignment

Worksheet 1-5 All problems