In the context of data analysis, identify a true statement about a causal-comparative study.
A. The most commonly used test is the chi-square test.
B. Means and standard deviations are calculated only if the variables involved are categorical.
C. The results of causal-comparative studies are trustable because they prove cause and effect.
D. The first step in a data analysis of a causal-comparative study is to construct frequency polygons.
Answer: D
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