Sampling in outcomes studies differs from that in traditional quantitative research in several ways. ...

ANS: A
The preferred methods of obtaining samples are different in outcomes studies; random sampling is not considered desirable and is seldom used. Heterogeneous, rather than homogeneous, samples are obtained. Rather than using sampling criteria that restrict subjects included in the study to decrease possible biases and that reduce the variance and increase the possibility of identifying a statistically significant difference, outcomes researchers seek large heterogeneous samples that reflect, as much as possible, all patients who would be receiving care in the real world.