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Math Help - hypothesis testing #2

  1. #1
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    hypothesis testing #2

    people with chronic kidney disease require hemodialysis, where their blood is passed through a machine that does the work of their kidneys. unfortunately blood clots can form around the connection to the machine and cause problems if they then lodge elsewhere in the body. a study of the effect of aspiring in helping reduce the formation of blood clots involved 44 subjects undergoing dialysis. of the 19 people receiving aspirin, 6 developed blood clots; of the 25 people receiving placebo 18 developed blood clots.

    perform a hypothesis test to determine if there is a reduction in the rate of blood clots with aspirin. include a statement of H_{0} and H_{1}, the test statistic and its distribution under H_{0}.
    Last edited by mr fantastic; November 12th 2010 at 06:17 PM. Reason: Title.
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  2. #2
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    Quote Originally Posted by wik_chick88 View Post
    people with chronic kidney disease require hemodialysis, where their blood is passed through a machine that does the work of their kidneys. unfortunately blood clots can form around the connection to the machine and cause problems if they then lodge elsewhere in the body. a study of the effect of aspiring in helping reduce the formation of blood clots involved 44 subjects undergoing dialysis. of the 19 people receiving aspirin, 6 developed blood clots; of the 25 people receiving placebo 18 developed blood clots.

    perform a hypothesis test to determine if there is a reduction in the rate of blood clots with aspirin. include a statement of H_{0} and H_{1}, the test statistic and its distribution under H_{0}.
    Please post what you have done tried.

    CB
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  3. #3
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    all i have so far is H_0: p = 0.72 (which is 18/25) and H_1: p < 0.72
    where do i go from here?
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  4. #4
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    This is from awhile ago, but presumably you'll still be working on this - your hypothesis isn't correct. You aren't performing a test on what a population proportion is - your interested in whether or not there is a significant different between those receiving the placebo and those taking aspirin. Thus your hypothesis should be to assume there is NO difference (Placebo-Proportion = Aspirin-Proportion), and find the probability of observing a difference as large as the one observed (Placebo-Proportion > Aspirin-Proportion).

    I would review notes on testing differences between population proportions, and the applicable tests involved.
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