Which study design am I describing?

1.A study to show if smoking is related to lung cancer. You assemble a group of smokers and nonsmokers today and follow them for 20 years to see if they develop lung cancer:

Prospective Cohort

2.A study to see if vitamins prevent cancer - you randomly assign two groups of people to either take vitamins or a placebo, follow them for 20 years and compare the rates of colon and breast cancer

Prospective Cohort

3.A study to see if living near power lines causes leukemia. You find a group of people who lived near power lines 20 years ago and a group of people who didn't. You compare rates of leukemia from 20 years ago up until the present.

Case -Control

4.A study to see if a high fat diet is related to colon cancer. You assemble a group of patients with colon cancer, match them to a group without colon cancer, and give each group a survey asking them questions about diet over the last 15 years.

5.A study to see if exercise is related to heart disease. You survey Americans in November 2012 and ask them a number of questions including whether they currently have heart disease and whether they currently exercise at least 3 times a week.

6.A study to see if taking intro to epi causes "brain mush." You identify a group of students that are currently taking intro to epi and a group of students who are not. You follow both groups for 2 years and measure the incidence of 'brain mush'.

7.A study to see if having parents who smoked is a risk factor for lung cancer. You identify a group of people who had parents who smoked between 1960 and 1980. You follow both groups up until the present and compare the rates of lunch cancer.

8.A study to see if tanning salons causes skin cancer. You assemble a group of patients with diagnosed skin cancer, match them to a group of subjects without skin cancer and survey each group to see how many have used tanning salons over the last 10 years.

9.A study to see if a good night's sleep improves attentiveness in class. You assemble a group of 500 students and measure how many fell asleep during class for a one week period. You ask each student to get a good nights sleep for three nights in a row, and then measure how many of the same students fell asleep during the next week of class.

Question 2 (1 Point)

What steps would you take to minimize bias and confounding in a case-control study?

Matching,