Senior Trip Tally
5
Options
Cruise to Bermuda
Camping in the Tetons
Snorkeling the Great Barrier Reef
Walking the Great Wall of China
83
21
41
Joel surveys all 150 seniors in his class to determine where they would like their senior trip to be. He gives them four choices:
Cruise to Bermuda, Camping in the Tetons, Snorkeling the Great Barrier Reef, and Walking the Great Wall of China. He records the
results in the table. What is the probability that the senior class goes snorkeling along the Great Barrier Reef (round to the nearest
thousandth)?

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