2.36. Crosson (1994, p. 168) described an analysis of published medical studies involving treatments for heart attacks. In the studies having randomiza tion and strong controls for bias, the new therapy provided improved treatment 9% of the time. In studies without randomization or other controls for bias, the new therapy provided improved treatment 58% of the time. Select the correct response(s).

(a) This result suggests it is better not to?