Which of the following is true of the one- shot case study preexperimental design (X O₁)? A) It does not provide a basis of comparing the level of O₁to what would happen when X was absent. B) There is no random assignment of test units. C) In this design, a group of test units is measured twice. D) Both A and B are correct.

Question

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The one-shot case study design lacks a control group, so it doesn't allow for comparison when X is absent (A), and it doesn't involve random assignment of test units (B).

Which of the Following Is True of the One- Shot