A light bulb's brightness is reduced when placed behind a screen. The amount of visible light bulb decreases by 25% with each additional layer that is added to the screen. with no screen, the light bulb produces 750 lumens. The lumen is a unit for measuring the toltal
quantity of visible light emitted by a source.
Select the correct equation that can be used to represent the lumen
OA L=750(0.975)^x
OB. 1 = 750(0.25)^x
OC L = 750(0.75)^x
OD L= 750(1.25)^x

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