In the textbook notation for experimental design A)X represents control group respondents. B)X refers to the method employed to measure the response variable. C)O represents the exposure of a respondent to an experimental treatment. D)X represents the exposure of a group to an experiential treatment whose effect is to be observed, and O represents the observation Or measurement taken on the group. E)O₁ and O₂ represent the matching of experimental and control groups.

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In the textbook notation for experimental design, X represents the exposure of a group to an experimental treatment whose effect is to be observed, and O represents the observation or measurement taken on the group. A represents the control group respondents, while R represents random assignment to groups. The other options (B, C, and E) do not accurately represent the notation system.

In the Textbook Notation for Experimental Design