A Statistics Teacher Wants to Know How Her Students Feel

A statistics teacher wants to know how her students feel about an introductory statistics course.She decides to administer a survey to a random sample of students taking the course.She has several sampling plans to choose from.Name the sampling strategy in each.
A.There are four ranks of students taking the class: freshmen, sophomores, juniors, and
seniors.Randomly select 15 students from each class rank.
B.Randomly select a class rank (freshmen, sophomores, juniors, and seniors) and survey
every student in that class rank.
C.Each student has a nine-digit student number.Randomly choose 60 numbers.
D.Using the class roster, select every fifth student from the list.

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