The equation ? y ? =0.39 x 2 +2.01x+50.13 ? approximates the number of people, in thousands, that are over 100 years of age, x years after the count began. what is the best estimate for the number of people, in thousands, 9 years after the count began? enter your answer, rounded to the nearest tenth, in the box. thousand

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