A researcher attempted to recruit all 150 of the patients seen in the emergency department in a three-month period for diverticulitis, but only 120 consented to participate. What is the sample size?
a. 150
b. 120
c. 30
d. 80%
ANS: B
A refusal rate is the number and percentage of subjects who declined to participate in the study. Patients who refuse to participate are not part of the sample, since they were only potential subjects, not actually included in the sample. The refusal rate is calculated by dividing the number of potential subjects refusing to participate by the number of potential subjects meeting sampling criteria and multiplying the results by 100%.
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