A researcher consented 75 subjects, but 15 dropped out of the study while it was still in progress. What was the sample attrition rate?
a. 15
b. 15%
c. 20%
d. 75%
ANS: C
Sample attrition rate formula = number subjects withdrawing ÷ sample size ? 100%.
For example, if a study had a sample size of 160 and 40 people withdrew from the study, the attrition rate would be 25%.
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