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The average waiting time per customer at a fast food restaurant has been 7.5 minutes. The customer waiting time has a normal distribution. The manager claims that the use of a new cashier system will decrease the average customer waiting time in the store. Based on a random sample of 16 customer transactions, the mean waiting time is 6.3 minutes and the standard deviation is 2 minutes per customer. What is the value of the test statistic we would use to test Ho?

A) t = -2.4 B) t = -1.2 C) t = -0.6 D) t = 2.4 E) z=-2.4

 

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