Alok , rashid and kulvinder want to save money to their friend john who needs money to buy books . they saved rupees 17 out of their pocket money for 3 , 8 and 9 days respectively . how much money they gave to john . use distributive property . what value do you learn from these friends?
plz solve

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