A supermarket claims that the average wait time at the checkout counter is less than 9 minutes. Assume that we know tha

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answerhappygod
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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 tha

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A supermarket claims that the average wait time at the checkoutcounter is lessthan 9 minutes. Assume that we know thatthe standard deviation of wait times is 2.5 minutes. We will testat 5% level of significance.
Consider
H0: mu >= 9
H1: mu < 9
A random sample of 50 customers yielded an average waittime of 8.2 minutes.
What is the critical value for the Zstat (Zstat isthe Z-test statistic)?
(Provide two decimal places)
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