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Math Help - Hypothesis Test

  1. #1
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    Hypothesis Test

    Can someone please help with the below problem?

    Suppose that you want to test the claim that the mean weight of male harbor seals is 40 pounds. You collect a sample of 100 seals and find that the mean weight in the sample is 40.8 pounds.The standard deviation is 4.

    Using significance level of 0.01 test the null hypothesis using 5-step procedure.
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  2. #2
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    Re: Hypothesis Test

    Okay, if you are asked to use the "5 step procedure" you should know what that procedure is! What are the "5 steps"?

    I don't know what you mean by the "5 step procedure" so I can't help you there. What I would do is find corresponding 'standard z value' for the standard normal distribution (with mean 0 and standard deviation 1). That is given by z= \frac{40.8- 40}{4}= .2. Then look up the probability of that z-value in a table of the standard normal distribution. (A good one on the internet is at Standard Normal Distribution Table) Is the probability of that greater than 1.00- 0.01= 0.99?
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  3. #3
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    Re: Hypothesis Test

    Sorry about that! The 5 step procedure is pictured here http://i.imgur.com/dSR2hG1.jpg. I think I see where to go with this one but now I'm stuck on a similar problem below.

    Suppose that you want to test the claim that the mean weight of male harbor seals is 40 pounds or less. You collect a sample of 100 seals and find that the mean weight in the sample is 40.8 pounds. The standard deviation is 4 pounds.
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