The work has not been graded but I like the output that was submitted to me. Is it possible for the same prof to do the next assignment I will be submitting? If possible, I will greatly appreciate it.
A supermarket claims that the average wait time at the checkout counter is less than 8 minutes. Assume that we know that the standard deviation of wait times is 2.5 minutes. We will test at a significance level of 10%.
H0: mu >= 8
H1: mu < 8
A random sample of 50 customers yielded an average wait time of 7.8 minutes.
What is the critical value for the Zstat (the Z-test statistic)?
(Provide two decimal places)
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