A study over a 10-year period showed that a certain mammogram test had a 50 perc
ID: 3382291 • Letter: A
Question
A study over a 10-year period showed that a certain mammogram test had a 50 percent rate of false positives. This indicates that:
about half the women tested actually had no cancer.
about half the tests indicated cancer.
about half the tests showed a cancer that didn't exist.
about half the tests missed a cancer that exists.
a.about half the women tested actually had no cancer.
b.about half the tests indicated cancer.
c.about half the tests showed a cancer that didn't exist.
d.about half the tests missed a cancer that exists.
Explanation / Answer
A false positive is saying someone has cancer when she doesn't have it.
So, it is
OPTION C: about half the tests showed a cancer that didn't exist.
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