Question

Error Analysis  A group of students is studying the number of people who play an instrument in their school. They surveyed everyone in their school. One of the students incorrectly said that the people they surveyed represents a sample because it only includes the people in their school. Identify the population. What could cause the​ student's error?
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Part 1
What is the population the students are​ studying?
A.
Everyone in all schools
B.
Everyone in their school who plays an instrument
C.
Everyone who plays an instrument
D.
Everyone in their school
Your answer is correct.
Part 2
Which of the following could cause the​ student's error?
A.
The student thought the population was everyone in their school.
B.
The student thought the population was everyone who plays an instrument in all schools.
C.
The student thought the population was everyone who does not play an instrument in their school.
D.
The student thought the population was everyone in all schools.

Answer 1

Part 1: Everyone in their school (you were correct).

Part 2: D. The student thought the population was everyone in all schools.
Explanation: believing the population is larger than the school would make the school survey seem like a sample. In fact the population here is just everyone in their school, and they surveyed the whole population (a census).