COGS 109 : COGS 109 - Course Guide

In a small study, 12 women with cervical cancer (cancer of the cervix) and 12 women with no apparent cervical cancer were contacted and asked whether they had ever used the hormone estrogen as a drug. Each woman with cancer was matched by age, race, and weight with a woman without the disease. This is an example of:

a) A randomized controlled trial

b)A prospective cohort study

c) A case-control study

d) A retrospective cohort study

Science Grade 9 Chemistry:

You are doing an experiment to see if drinking coffee at breakfast improves your marks. You divide your class into 2 groups. Group A drinks coffee in the morning and Group B does not drink coffee. When the students come into class you have them write a test. You found the average mark for Group A was 75% and the average mark for Group B 90%. (6 marks)

What is the independent variable in your study?

What is the dependent variable in your study?

What is the control group in your study?

List 2 controls you should have in your study.

What is your conclusion for the study?

What could be the danger of relying on case study evidence?