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According to a previous study, check out times at a supermarket are between 2 to 7...

  1. According to a previous study, check out times at a supermarket are between 2 to 7 minutes (120 to 8400 seconds.) A survey involving a random sample of customers of the supermarket is planned and the first order of

business is to decide on an appropriate sample size. The 95% level of confidence will be used. (4 points)

  1. What is the planning value for the population standard deviation to be used in the sample size formula for estimating the population mean checkout time?
  2. How large should the sample size be if the desired margin of error is 30

seconds?

Math   Statistics-And-Probability   
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