Please help! I don't understand this at all!
1. Lin wants to know how many games teenagers in the United States have on their phones.
What is the population for Lin's question?
2. Lin wants to know how many games teenagers in the United States have on their phones.
Explain why collecting data for this population would be difficult.
3. Lin wants to know how many games teenagers in the United States have on their phones.
Give an example of a sample Lin could use to help answer her question.

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