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Thread: Hypothesis question

  1. #1
    New Member
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    Oct 2012
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    Hypothesis question

    I have been trying to figure this one out, it seems like I have the equations correct, but am not putting everything together... I hope someone can help!

    A random sample is selected from a normal population. The population mean is u = 60 and the population standard deviation is sigma = 15. After a treatment is given to the members of the sample, the sample mean is M = 65. The sample size is 25.

    Null Hypothesis is Ho: u = 60
    Hi: u<>60
    The probability of a Type 1 Error is 0.05

    From my calculations, I am getting: SE[M] = 3, and Z = 5/3. What I can't figure out is: Is the sample mean sufficient to conclude that the treatment has a significant effect? Do I need to calculate a P-value? Please help!!!! Thank you!!!

  2. #2
    Elite Member
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    Apr 2005
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    I believe the most common difficulty with such problems is knowing when you are done.

    Were you asked to calculate a p-value?

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