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Type II error hypothesis question

  1. Apr 1, 2014 #1
    1. The problem statement, all variables and given/known data
    Here is the question (I am only confused about part b):
    5I239yq.png

    Here is the solution given by my professor:
    ZVVYyrN.png

    3. The attempt at a solution
    However, I do not agree with part b and honestly have no clue where they got that formula from. I used the method taught in my class along with a bit of intuition and came up with a beta value of 0.4825. Does anyone agree with me work or is the solution from the professor actually correct?
    XIwPuTZ.png
     
  2. jcsd
  3. Apr 5, 2014 #2
    Anyone got an idea? :O
     
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