Studies that investigate differences among groups not determined by random assignment are known as
A) double-blind trials.
B) triple-blind trials.
C) observational studies.
D) quasi-experimental.

Question

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The Answer of Studies that investigate differences among groups not determined by random assignment are known as
A) double-blind trials.
B) triple-blind trials.
C) observational studies.
D) quasi-experimental.

Studies That Investigate Differences Among Groups Not Determined by Random