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A supermarket claims that the average wait time at the checkout counter is less than 9 minutes. Assume that we know that the standard deviation of wait times is 2.5 minutes.
Consider
H0: mu >= 9
H1: mu < 9
A random sample of 50 customers yielded an average wait time of 8.2 minutes.
What is the value of the test statistic (Zstat or z-sub-xbar)?
(Provide two decimal places)
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