A particular fast-food restaurant chain has 6,289 outlets with drive-through windows. To attract more customers to its drive-through services, the company is considering offering a 50% discount to customers who wait more than a specified number of minutes to receive their order. To help determine what the time limit should be, the company decided to estimate the average waiting time at a particular drive-through window in Dallas, Texas. For 7 consecutive days, the worker taking customers’ orders recorded the time that every order was placed. The worker who handed the order to the customer recorded the time of delivery. In both cases, workers used synchronized digital clocks that reported the time to the nearest second. At the end of the 7-day period, 2,109 orders had been timed.

a. Describe the process of interest at the Dallas restaurant.

b. Describe the variable of interest.

c. Describe the sample.

d. Describe the inference of interest.

e. Describe how the reliability of the inference could be measured.