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Homework Help: Hypothesis testing - normal

  1. Sep 4, 2008 #1
    1. The problem statement, all variables and given/known data
    Having trouble understanding the question, which is...
    voltage specified to be 130
    Sample of 20 readings gives sample mean of 128.25
    Also given s.d.=3.

    "It is important that the voltage not be allowed to drop below 128 volts. What is the probability of rejecting mean of 130 at the 1% level if in fact the mean is 128?

    2. Relevant equations
    this is part c, already tested the hypothesis regarding the true mean and found the critical value for 1%.

    3. The attempt at a solution
    I think this involves bayesian methods but the language (grammar) of the question confuses me, if someone could restate it that would be great.
  2. jcsd
  3. Sep 5, 2008 #2
    I have figured it out
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