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Critical region in hypothesis

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm been having problems with hypothesis questions like the example below

    The manager of the supermarket thinks that the probability of a person buying a gigantic
    chocolate bar is only 0.02. To test whether this hypothesis is true the manager decides to
    take a random sample of 200 people who bought chocolate bars.

    Find the critical region that would enable the manager to test whether or not there is
    evidence that the probability is different from 0.02. The probability of each tail
    should be as close to 2.5% as possible

    2. Relevant equations

    Well X ~ B(200,0.02) I think.

    3. The attempt at a solution
    The probability of each tail should be as close to 2.5% as possible - What does this mean exactly. Does it help in finding the critical region. I've been using trial and error to find it... I'm sure there is a better method.

  2. jcsd
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