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k123p k123p
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7 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. The 95 confidence interval for the average checkout time for all customers is _____.
 a. 3 to 5
  b. 1.36 to 4.64
  c. 2.804 to 3.196
  d. 1.04 to 4.96
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alarosealarose
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4 years ago
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Thank you
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