Stefan wants to know how many students in his school enjoy watching movies on TV. He asks this questions to all 22 students in his math class and finds that 65% of his classmates enjoy watching movies on TV. He claims that 65% of the school's student population would be expected to enjoy watching movies on TV. Is Stefan making a valid inference about his population?

a. Yes, it is a valid inference because he asked all 22 students in his math class

b. Yes, it is a valid inference because his classmates make up a random sample of the students in the school

c. No, it is not a valid inference because he asked all 22 students in his math class instead of taking a sample from his history class

d. No, it is not a valid inference because his classmates do not make up a random sample of the students in the school.

Question

Mathematics

Evelin Blackwell

21 May, 17:50

Stefan wants to know how many students in his school enjoy watching movies on TV. He asks this questions to all 22 students in his math class and finds that 65% of his classmates enjoy watching movies on TV. He claims that 65% of the school's student population would be expected to enjoy watching movies on TV. Is Stefan making a valid inference about his population?

a. Yes, it is a valid inference because he asked all 22 students in his math class

b. Yes, it is a valid inference because his classmates make up a random sample of the students in the school

c. No, it is not a valid inference because he asked all 22 students in his math class instead of taking a sample from his history class

d. No, it is not a valid inference because his classmates do not make up a random sample of the students in the school.

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Answers (1)

Know the Answer?

Wayne · Answer 1

The answer is

d. No, it is not a valid inference because his classmates do not make up a random sample of the students in the school

He should have asked a number of students from difference classes to make the data a good representative of the school's population.