Mr. Blake asked the 60 students in his computer classes whether they prefer using a mouse
or a touchpad. This table shows the relative frequencies from the survey.
Mouse
0.25
0.25
0.50
Touchpad
0.20
0.30
0.50
Seventh graders
Eighth graders
Total
Based on the data in the table, which statements are true? Select all that apply.
Most seventh graders prefer to use a mouse.
Total
0.45
0.55
1.00
Students who prefer to use a touchpad are less likely to be eighth graders.
There is an association between a student's grade level and computer
preference.
There is no association between a student's grade level and computer preference