1.A company wants to test whether its new pain medication reduces chronic back pain in adults. 73 adult volunteers with chronic back pain wererandomly assignedto either a treatment or control group. The treatment group received the new medication, while the control group received a placebo. After 1 week, participants were asked if they had experienced a reduction in pain over the last week.

Reduction in pain? Yes No Total Treatment 21 17 38 Control 12 23 35 Total 33 40 73