Question

cheryl wants to find the number of hours seventh - graders do homework each week. there are 297 girls and boys in seventh grade. which is the best way for cheryl to get a representative sample without spending too much time?

• she can survey 15 of her friends in the school.
• she can survey every sixth - grade student in the school.
• she can randomly survey 50 girls in the entire school.
• she can randomly survey 50 seventh - graders in the school.

Explanation:

A representative sample must match the population being studied (seventh-graders) and avoid bias. Surveying friends creates bias, sixth-graders are not the target group, and only girls excludes boys. Randomly surveying 50 seventh-graders is unbiased and targets the correct group without excessive time spent.

Answer:

D. She can randomly survey 50 seventh-graders in the school.