Question

East Brunswick High school has 1200 students. A sample of 240 students was selected to study the average monthly income of students. Since sample size is greater than 30, how much error would you expect in finding the average income of all students?

Answer 1

Answer is 20% error.

Therefore,

Refer below for the explanation.

Explanation:

As per the question,

Students 1200,

Sample of 240 students,

Sample size is greater than 30.

Hence,

240/1200×100=20%.

Answer 2

20%

Explanation:

Since sample size is greater than 30%

Sample of students = 240

Total student = 1200

Therefore we have

240/1200 * 100=2%