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Counselors at a college want to poll students about
how much time the students spend studying. Which of
the following best describes a systematic sample of
students?
The counselors form
6
groups of students based on the numbers of
classes
the students are taking. Then, the counselors select 9
students at random
from each group.
The counselors use a computer program to draw
54
students at
random and
select these students. Every set of 54 students is
equally likely to be drawn
by the computer program.
The counselors take a list of the students and select every 6th
student
until
54
students are selected.
A facilities supervisor at a sports stadium wants to rate
the condition of the seats at the stadium. Which of the
following best describes a convenience sample of seats?
All of the seats in the VIP section are easily accessible. So, the
supervisor selects the
72 seats in this section.
The supervisor uses a computer program to draw
72
seats at
random and selects these seats. Every set of
72
seats is equally
likely to be drawn by the computer program.
The supervisor takes a list of the seats and selects every
3
rd
seat
until
72
seats are selected.
The organizers of a conference want to survey attendees
about the registration fee. Which of the following best
describes a stratified sample of attendees?
The organizers form groups of 8 attendees based on the day the
attendees registered. Then, the organizers randomly choose 7
groups and select all of the attendees in these groups.
