A Researcher Plans a School-District-Wide Study to Compare Methods a and B

A researcher plans a school-district-wide study to compare Methods A and B of increasing physical activity in third graders. Which of the following procedures would be MOST appropriate for selecting a sample?

A) Obtain permission from a cooperative principal to select the sample from students in her school.
B) Require all students enrolled in physical education classes to serve as subjects.
C) Use students from one school as subjects to receive the Method A treatment and students from a second school to receive the Method B treatment.
D) Define the population as all students in the district and select a random sample.

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