Select the correct answer 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 group's method will give the most accurate, unbiased results?
West Coast
Northeast
Researchers observed and recorded the average wait times
each day between the hours of 8 a. m. and 11 a. m.
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 they've experienced.
Midwest
Researchers observed and recorded the average wait times
during random time periods over the course of a week.
ОА
Midwest
О В.
South
О с.
West Coast
D.
Northeast