In a general experimental design, subjects are measured on a dependent variable. This is essentially pre-test. Then the subjects are exposed to a stimulus that represents an independent variable, and re-measured on the dependent variable. This is called post-test. Differences noted between the first and second measurements on the dependent variable are then attributed to the influence of the _____.

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A. The correct answer is "A" because in an experimental design, subjects are measured on a dependent variable. This is essentially pre-test. Then the subjects are exposed to a stimulus that represents an independent variable, and re-measured on the dependent variable. This is called post-test. Differences noted between the first and second measurements on the dependent variable are then attributed to the influence of the independent variable.
B. This is an incorrect answer because in an experimental design, subjects are measured on a dependent variable. This is essentially pre-test. Then the subjects are exposed to a stimulus that represents an independent variable, and re-measured on the dependent variable. This is called post-test. Differences noted between the first and second measurements on the dependent variable are then attributed to the influence of the independent variable not of the dependent variable.
C. This is an incorrect answer because in an experimental design, subjects are measured on a dependent variable. This is essentially pre-test. Then the subjects are exposed to a stimulus that represents an independent variable, and re-measured on the dependent variable. This is called post-test. Differences noted between the first and second measurements on the dependent variable are then attributed to the influence of the independent variable not of the pre-test.
D. This is an incorrect answer because in an experimental design, subjects are measured on a dependent variable. This is essentially pre-test. Then the subjects are exposed to a stimulus that represents an independent variable, and re-measured on the dependent variable. This is called post-test. Differences noted between the first and second measurements on the dependent variable are then attributed to the influence of the independent variable not of the post-test.

In a General Experimental Design, Subjects Are Measured on a Dependent