A Researcher Is Comparing a New and Less Expensive Treatment

A researcher is comparing a new and less expensive treatment with an established treatment, in hopes of showing that there is no difference in outcome. The researcher does not perform a power analysis and, consequently, selects a sample size that is smaller than what would be recommended for an analysis of variance. The results show that there is no significant difference in outcome between the two treatments. Which type of validity is affected by this?

A) Construct validity
B) Internal validity
C) External validity
D) Statistical conclusion validity

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