A large corporation sent out four groups of people to conduct observational studies on the average walt 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 group's 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. South Researchers used a phone survey to ask residents of the restaurants' city about the wait times they've experienced. West Coast Researchers surveyed restaurant-goers on their wait times as they left the building over the course of one full business day. Midwest Researchers observed and recorded the average wait times during random time periods over the course of a week. OA. West Coast B. Northeast OC. Midwest D. South