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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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Skoochy Skoochy
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6 years ago
The manager of a grocery store has selected a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is 1 minute. If the confidence coefficient is reduced to .80, the standard error of the mean _____.
 a. will increase
  b. will decrease
  c. remains unchanged
  d. becomes negative
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#1
6 years ago
c
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