Question
The average length of time customers spent on waiting at ABC Store's check-out counter before a new P.O.S. system was installed was 5.3 minutes. A
The average length of time customers spent on waiting at ABC Store's check-out counter before a new P.O.S.
system was installed was 5.3 minutes. A sample of 49 customers randomly selected at
the check-out counter after the new P.O.S. system was installed showed that the average
waiting time was 5.8 minutes with a sample standard deviation of 2.3 minutes. We wish
to determine if there has been a significant increase (from 5.3 minutes) in the average
waiting time after the P.O.S. system was installed. Take = 0.05.
15. Write appropriate null and alternate hypothesis.
16. Determine the critical value for this test.
17. Calculate test statistic.
18. Based on above information, what is your conclusion of the test?
19. Construct a 95% confidence interval for the average waiting time after the
new P.O.S. system was installed.
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