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Thread: Sampling Distribution Question

  1. #1
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    Sampling Distribution Question




    I found an question while reading the textbook, but i not really understand how to answer it, hope to get some help from you guys.

    A restaurant offers pizza delivery service to a campus dormitory. Delivery times follow a
    normal distribution with mean 20 minutes and standard deviation 5 minutes.

    1.Suppose the restaurant plans to expand its delivery network, and offers service to
    commercial areas as well. A random sample of delivery times is required to estimate the
    new population mean of delivery time. How large a sample is needed to ensure the
    probability that the sample mean is larger than the new population mean by more than 2
    minutes is less than 0.05? Assume the new population standard deviation is 10 minutes.

  2. #2
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    Re: Sampling Distribution Question


    Find how many standard errors you need and work backwards from there.

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