SOLUTION: the amount of time customers at a quick change motor oil store spend waiting for their cars to be serviced has the normal distribution with mean u and standard deviation q= 4 minut

Question 330666: the amount of time customers at a quick change motor oil store spend waiting for their cars to be serviced has the normal distribution with mean u and standard deviation q= 4 minutes. it is compagny policy that the customer wait time should be 20 minutes or less. the manager of a particular store selects a random sample of 150 customer wait times and observes a mean wait time of 21 minutes.
if the manager had selected more custemers for her sample, the margin of error in the 95% confidence interval computed would:
a- become larger
b- not change
c- become smaller
d- becomes larger or smaller depending on sample
thank you very kindly
Answer by berenice11(1) (Show Source): You can put this solution on YOUR website!

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