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Advanced Placement (AP) , 17.02.2022 19:25

An experiment compared the adhesion of 2 types of paint, A and B, to 3 types of metal, 1, 2, and 3, used in automobiles. Thirty sheets of metal were used in the experiment: 10 of Metal 1, 10 of Metal 2, and 10 of Metal 3. Half of each metal type will receive paint A and the other half will receive paint B. The adhesion of the paints was measured, and the measures were compared. How many experimental units are in the experiment?

A. 2

B.3

C. 10

D. 30

E. 60

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There are 30 experimental units in the experiment, which are the 30: the thirty sheets of metal.

Explanation:

This table shows you how the experimental units, sheets of metal, were treated:

               Metal 1         Metal 2       Metal 3       Total

Paint A         5                     5               5                15

Paint B         5                     5               5                15

Total            10                   10              10               30

Fifteen sheets (units) were treated with paint A: 5 of metal 1, 5 of metal 2, and 5 of metal 3.

Fifteen sheets (units) were treated with paint B: 5 of metal 1, 5 of metal 2, and 5 of metal 3.

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