Marcus performed an experiment by spinning a spinner a set number of times and noting the color on which the spinner landed. The table below shows the results. Result
Frequency
Blue
4
Red
3
Green
5
Yellow
6

What is the experimental probability for the lowest frequency?
StartFraction 3 over 18 EndFraction
StartFraction 4 over 18 EndFraction
StartFraction 18 over 4 EndFraction
StartFraction 18 over 3 EndFraction

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