Francesca is afraid she won't have enough money to treat herself and two friends to a movie and snacks. movie tickets cost $7.50 each, medium popcorns cost $2.95 each, and medium soft drinks cost $2.70 each. round each amount up to the nearest whole dollar to find a reasonable overestimate of the total cost of the evening's entertainment. a. $14 b. $30 c. $42 d. $45

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