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A large corporation sent out four groups of people to conduct observational studies on the...

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A large corporation sent out four groups of people to conduct observational studies on the average walt time at four different restaurants in itsrestaurant 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 group's method will give the most accurate, unbiased results?NortheastResearchers observed and recorded the average wait timeseach day between the hours of 8 a.m. and 11 a.m.SouthResearchers used a phone survey to ask residents of therestaurants' city about the wait times they've experienced.A.B. NortheastC. MidwestD.West CoastSouthWest CoastResearchers surveyed restaurant-goers on their wait times asthey left the building over the course of one full business day.MidwestResearchers observed and recorded the average wait timesduring random time periods over the course of a week.

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