For the past few years the number of cus-tomers of a, Basic Statistics

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For the past few years the number of cus-tomers of a

For the past few years, the number of cus-tomers of a drive-up bank in New York has averaged 20 per hour, with a standard deviation of 3 per hour.

This year, another bank 1 mile away opened a drive-up window. The manager of the first bank believes that this will result in a decrease in the number ofcustomers. The number of customers who arrivedduring 36 randomly selected hours was recorded.Can we conclude at the 5% significance level thatthe manager is correct?

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Basic Statistics: For the past few years the number of cus-tomers of a

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