Scatter Plots

Scatter Plots

How do we interpret scatter plots?

Scatter Plot

• A graph in which the values of two variables are plotted along two axes

• The pattern of the resulting points reveals any correlation present

Example

The local ice cream shop keeps track of how much ice cream they sell versus the noon temperature on that day. Here are their figures for the last 12 days:

And here is the same data as a Scatter Plot:

Notice anything?

Multiple Choice

What is the correlation between length of running start and distance of jump?

• positive: the further you run the further you jump

• negative: the less you run the less distance of your jump

• positive: the further your running start the less your distance

Multiple Choice

What type of association does this scatter plot show?

• positive linear association

• negative linear association

• no association

• nonlinear association

Multiple Choice

If a scatterplot has no association then...

• ...it has no ordered pairs

• ...it has ordered pairs that have a negative pattern

• ...its ordered pairs have no predictable pattern

• ...if it makes a lion on a graph (roar!)

Multiple Choice

As the age of the car increases, its value decreases. Which scatterplot represents this relationship?

• A
• B
• C
• D

Multiple Choice

What is the correlation?

• Negative correlation
• No correlation
• Positive correlation
• All of the above