A chain retailer has target service levels that each location is expected to deliver. The target established for customer wait times at checkout is 210 seconds or less. The retailer opened a new location, called Store #140. An analyst was tasked with testing wait times at the new store. Any store found in violation of the 210-seconds-or-less standard must take action to reduce waiting times. The analyst took a random sample of 34 customers at Store #140 and measured the time they had to wait to check out. In the sample of customers, the mean waiting time was 245 seconds. Drawing on past experience with check out times at this retailer, the analyst assumed a population standard deviation of 86 seconds. Perform and interpret a hypothesis test to determine whether the population mean waiting time at the Store #140 is longer than 210 seconds at the ?? = 0.05 significance level. Is there evidence here that Store #140 needs to take action to reduce waiting times?
1. A chain retailer has target service levels that each location is expected to deliver. The target
established for customer wait times at checkout is 210 seconds or less. The retailer opened a new
location, called Store #140. An analyst was tasked with testing wait times at the new store. Any store
found in violation of the 210-seconds-or-less standard must take action to reduce waiting times.
The analyst took a random sample of 34 customers at Store #140 and measured the time they had to
wait to check out. In the sample of customers, the mean waiting time was 245 seconds. Drawing on past
experience with check out times at this retailer, the analyst assumed a population standard deviation of
86 seconds.
Perform and interpret a hypothesis test to determine whether the population mean waiting time at the
Store #140 is longer than 210 seconds at the ?? = 0.05 significance level. Is there evidence here that
Store #140 needs to take action to reduce waiting times?
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