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Which of the following is least suited to providing clear evidence about a causal relationship between the independent and dependent variables?
a. classical experimental design
b. Solomon four-group design post
c. test-only group design
d. one-shot case study
e. all of four choices are equally effective in providing evidence of a causal relationship

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Answer:

d. one-shot case study

Explanation:

One shot case is less ideal because it focuses on a single group being examined on a single occasion after an occurrence, procedure or intervention has been undergone.

Since there is no control group for reference, it is a poor design; any observed changes are only believed to have been triggered by the incident.

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