Chester has less than $25 to spend at the county fair. the entrance fee is $5, and each ride costs $3. the number of rides, r, that chester can go on is represented by the inequality 3r + 5 < 25. select the most amount of rides chester can go on without overspending. a: 4 b: 6 c: 9 d: 10

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