11.2 Scatter Plots

Scatter Plots

A scatter plot is a graph that relates two groups of data.The purpose of a scatter plot is to show how (or if) the data is related.

Example:

The purpose of a scatter plot is to show how (or if) the data is related.What is the relationship here? Is the data on

the x-axis related to the data on the y-axis?

Is there a relationship between height and shoe size?

There are 3 types of relationships.

The purpose of a scatter plot is to show how (or if) the data is related.A positive correlatio

n

A negative correlatio

n

No correlatio

n This

means as x is

increasing, y is also

increasing

This means as

x is increasing,

y is decreasing

This means

there is no relationship between

x and y

A positive correlation as x is increasing, y is also increasing

A negative correlation as x is increasing, y is decreasing

No correlation No relation between x and y

Peanut butter

When making a scatter plot, all the regular graphing rules applied.

What type of correlation do you think the following data sets have?

Study time, gradesAge of car, value of car

Height, intelligenceShoe size, salary

Miles per gallon, gas expenseWindchill, ice cream sales