+ Reply to Thread
Results 1 to 2 of 2

Thread: Sampling Distribution Question

  1. #1
    Points: 7, Level: 1
    Level completed: 13%, Points required for next Level: 43

    Thanked 0 Times in 0 Posts

    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
    Points: 1,974, Level: 26
    Level completed: 74%, Points required for next Level: 26

    New Zealand
    Thanked 48 Times in 47 Posts

    Re: Sampling Distribution Question

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

+ Reply to Thread


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Advertise on Talk Stats