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Suppose you have a close friend who has a lump in her breast and must have a mammogram. Of 100 women like her, 10 of them actually have a malignant tumor and 90 of them do not. Of the 10 women who actually have a tumor, the mammogram indicates correctly that 9 of them have a tumor and indicates incorrectly that 1 of them does not have a tumor. Of the 90 women who do not have a tumor, the mammogram indicates correctly that 81 of them do not have a tumor and indicates incorrectly that 9 of them do have a tumor. The table below summarizes all of this information. Imagine that your friend tests positive (as if she had a tumor), what is the likelihood that she actually has a tumor?
90% ?
Bonus Questions
Q) Does the Earth go around the Sun, or does the Sun go around the Earth?
Earth goes around the Sun (duh)
Q) How long does it take for the Earth to go around the Sun? (one day, one month, one year)
One year
Q) A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
5 cents
Q) In a lake, there is a patch of lilypads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?[/QUOTE]
47 days
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