Researchers were interested in determining if individuals who worked nights were more likely to use sick time. The researchers compared the work histories of 230 individuals who worked the night shift with 255 individuals who worked the day shift. The sample came from work histories of employees at BetterBread Bakery.
The study showed that individuals who worked nights were 23% more likely to use sick time. According to DeVeaux and Velleman, does this study present convincing evidence that individuals who worked nights are more likely to use sick time?
A. Yes, this was a comparative study.

Question

Researchers were interested in determining if individuals who worked nights were more likely to use sick time. The researchers compared the work histories of 230 individuals who worked the night shift with 255 individuals who worked the day shift. The sample came from work histories of employees at BetterBread Bakery. 
The study showed that individuals who worked nights were 23% more likely to use sick time. According to DeVeaux and Velleman, does this study present convincing evidence that individuals who worked nights are more likely to use sick time? 
A.	Yes, this was a comparative study.