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Finish the sentence: A relatively small sample in a(n) can still have strong internal validity if the sample is A. observational; self-selected B. non-experimental; biased

Finish the sentence: A relatively small sample in a(n) can still have strong internal validity if the sample is A. observational; self-selected B. non-experimental; biased C. experiment; random D. experiment ; at least 1,000 participants

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