A Reviewer Reads a Research Report and Notes That the Number

A reviewer reads a research report and notes that the number of subjects in the original sample is larger than the number in the final analysis.Besides attrition of subjects,this discrepancy is likely because

A) data from the control group are not included in the analysis.
B) essential data is missing from subjects no longer included.
C) subjects producing outlying data have been excluded from the results.
D) the final analysis usually discusses data from the experimental group only.

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