Riva wrote this expression to describe the amount she paid for each movie ticket. 25 ÷ t which situation could be described by this expression? a. riva knows that each ticket cost $25. she does not know how many tickets she bought. b. riva knows she paid a total of $25. she does not know how many tickets she bought. c. riva knows she paid a total of $25. she does not know how much popcorn and a drink will cost. d. riva knows she paid $25 a ticket. she does not know the total amount she spent.

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