MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A department store chain is interested in estimating the mean amount its credit card customers spent on their first visit to the chain’s new store in the mall. 18 credit card accounts were randomly sampled and analyzed with the following results: X¯  = $40.50 and S  = 15.  Assuming the distribution of the amount spent on their first visit is normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for µ?

multiple choice

  1. Approximately normal with a mean of $40.50
  2. distribution with 15 degrees of   freedom
  3. distribution with 17 degrees of   freedom
  4. A standard normal  distribution

 

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