a large corporation sent out four groups of p...

a large corporation sent out four groups of people to conduct observational studies on the average wait time at four different restaurants in its restaurant group. the restaurants have approximately the same ratings in terms of quality and popularity. in their reports to the company board, each of the four groups described different methods used to conduct their studies, as shown in the table. which groups method will give the most accurate, unbiased results? northeast: researchers observed and recorded the average wait times each day between the hours of 8 a.m. and 11 a.m. west coast: researchers surveyed restaurant - goers on their wait times as they left the building over the course of one full business day. south: researchers used a phone survey to ask residents of the restaurants city about the wait times theyve experienced. midwest: researchers observed and recorded the average wait times during random time periods over the course of a week. a. northeast b. west coast c. south d. midwest

Answer

# Brief Explanations: The Midwest group's method is best as it observes during random time - periods over a week. The Northeast group only observes in the morning, which may not represent overall wait - times. The West Coast group only observes on one business day, which could be an outlier. The South group uses a phone survey which may have recall bias and not all respondents may have visited the restaurants recently. # Answer: D. Midwest