Question

1. Two oncologists, Drs. Nodule and Smith independently examined 200 biopsies for evidence of
invasive breast cancer. Dr. Nodule diagnosed 20 biopsies as “positive” for invasive breast cancer.
Dr. Smith diagnosed 15 biopsies as “positive” for invasive breast cancer, 10 of which were
also diagnosed as positive by Dr. Nodule.
Calculate the % positive agreement between Drs. Nodule and Smith. Please round to the nearest
percent.
a. 93%
b. 50%
c. 43%
d. 40%
e. 34%

2.The incidence of heart attacks among smokers in a community is 30.0 per 100,000 per year. The
incidence of heart attacks among nonsmokers
in this community is 4.0 per 100,000 per year.
The proportion of nonsmokers
in this community is 75%.
What proportion of the risk of heart attacks among smokers can be attributed to smoking?
(Select one)
a. 6.5%
b. 26.0%
c. 76.0%
d. 86.7%

3.What proportion of the risk of heart attacks in the total population can be attributed to smoking?
(Select one)
a. 21.3%
b. 61.9%
c. 82.2%
d. Cannot be calculated given the information provided.

Answer 1

1)34%[dr.nodule 20,dr.smith 15 in which dr.nodule also diagnose 10)so 20+15=35 nearest one is 34%

2)26%. (Total heart attack cases 100% non smokers 75% then smokers 100-75=25)nearest is 26%

3)d(risk of exposed and non exposed not given)