1. Three drivers competed in the same fifteen drag races. The mean and standard deviation for the race times of each of the drivers are given.
Driver A had a mean race time of 4.01 seconds and bc N a standard deviation of 0.05
seconds.
Driver B had a mean race time of 3.96 seconds and a standard deviation of 0.12
seconds.
Driver C had a mean race time of 3.99 seconds and a standard deviation of 0.19
seconds.
a. Which driver's race times were the most variable?
Which drivers race times were most variable

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