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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to
The manager of a grocery store has taken 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 one minute.
If the confidence coefficient is reduced to .80, the standard error of the mean:
a. will decrease
b.remains unchanged
c. becomes negative
d. will increase
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