Bill is driving with his family for his summer vacation. His total trip is 425 miles. His family has 205 miles to go after stopping for dinner. Which equation should be used to find the distance Bill’s family drove before dinner? A. 425 = x +205
B. 425 = x - 205
C. 425 = x/205
D. 425 = 205x

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