George brought a shirt and a pair of pants at a clothing store. the pants cost $5.30 more than the shirt, and he used a $15 off coupon to purchase the shirt. the equation below is used to determine the cost of the shirt before coupon, s.
s- $15 = $15.92
how much did the pants cost ?
a. $30.92
b. $21.22
c. $36.22
d. $25.63

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias