A tire company wants to determine if tires made with a new type of tread will last longer than tires made with the original type of tread. The company has access to 20 different vehicles and wants to use a randomized block design for the experiment.
Which of the following variables would be the best to block the experimental units?
A.type of vehicle
B. year of vehicle
C.make of the vehicle
D.color of the vehicle

The matched pairs design term has to do with the situation in which participants are randomly assigned to an experiment or a control group.

For a each participant assigned to an experimental group, another is assigned to the control group.

Thus, a matched pairs design because both types of tread were randomly assigned to each vehicle.

The procedure that describes a completely randomized design for this experiment because the tires are randomly assigned to each vehicle.

In this case, the procedure describes a completely randomized design for this experiment because the tires are randomly assigned to each vehicle.

The variables that would be the best to block the experimental units is A .type of vehicle.

Learn more about matched pairs design:

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