A supermarket claims that the average wait time at the checkout counter is less than 9 minutes. We can assume that the p

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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. We can assume that the p

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A supermarket claims that the average wait time at the checkoutcounter is less than 9 minutes. We can assume that thepopulation is Normally distributed.
Consider
H0: mu >= 9
H1: mu < 9
A random sample of 50 customers yielded an average waittime of 8.5 minutes and a standard deviation of 2.5 minutes.
What is the value of the test statistic (tstat ort-sub-xbar)?
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