To estimate the mean number of hours a student at a major university spent in the library,a researcher obtained the list of students from the registrar's office,from which she can select a random sample of 200 students.This list is a .

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The Answer of To estimate the mean number of hours a student at a major university spent in the library,a researcher obtained the list of students from the registrar's office,from which she can select a random sample of 200 students.This list is a .

To Estimate the Mean Number of Hours a Student at a Major