Provide the width of project duration range (not dates) at plus and minus ten percent about the probability of expected completion time based on PERT and MCS results. For example, if the expected completion time is d days, and the corresponding probability is p%, find the duration range corresponding to p-10% to p 10% probability

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