An advertising company is curious about the impact the lengths of their television advertisements have on viewers' feelings about a product. They showed advertisements of different lengths to a group of volunteers and
asked the volunteers to rate how positive they felt about the product on a scale of 1 to 10. Their data is shown
in the table below.
Avg. product rating
6.0
7.0
5.0
3.0
2.5
Ad length (seconds)
30
45
60
75
90
All of the scatter plots below display the data correctly, but which one of them displays the data best?
By convention, a good scatter plot uses a reasonable scale on both axes and puts the explanatory variable on the c-
axis.