1. The health department was able to provide a more comprehensive number of people who did and did not have cholera. According to the health department records, there were 500 students in the school. Two hundred of these students had eaten at the cafeteria, had had some sort of fruit or vegetable with their meal, and presented symptoms. One hundred and fifty students had eaten at the cafeteria but did not have any fruit or vegetable, nor were any of these students sick. Forty students had eaten at the cafeteria and were sick, but they had not eaten any fruits or vegetables.
a) Create a 2 X 2 from the information provided
b) Calculate the Relative Risk to determine how likely students were to have the disease if they were exposed
c) Interpret this value
2. In a small pilot study, 12 women with uterine cancer and 12 with no apparent disease were contacted and asked whether they had ever used estrogens. Each woman with cancer was matched by age, race, weight, and parity to a woman without the disease. The results are shown below.
|
Pair Number
|
Women WITH uterine cancer
|
Women WITHOUT uterine cancer
|
|
1
|
Estrogen user
|
Estrogen nonuser
|
|
2
|
Estrogen nonuser
|
Estrogen nonuser
|
|
3
|
Estrogen user
|
Estrogen user
|
|
4
|
Estrogen user
|
Estrogen user
|
|
5
|
Estrogen user
|
Estrogen nonuser
|
|
6
|
Estrogen nonuser
|
Estrogen nonuser
|
|
7
|
Estrogen user
|
Estrogen nonuser
|
|
8
|
Estrogen user
|
Estrogen nonuser
|
|
9
|
Estrogen nonuser
|
Estrogen user
|
|
10
|
Estrogen nonuser
|
Estrogen user
|
|
11
|
Estrogen user
|
Estrogen nonuser
|
|
12
|
Estrogen user
|
Estrogen nonuser
|
a) What type of study is this?
b) Create a 2 X 2 from the information provided
c) Calculate the appropriate statistic to determine the odds of contracting uterine cancer when using estrogen