In a group, 50 persons play basketball, 20 play football and 10 play both. How many play at least one of the two games?​

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

Use circumcenter theorem to solve for the given values

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