Suppose a school district decides to randomly test high school students for attention deficit
Disorder (ADD). There are three high schools in the district, each with grades 9-12. The school
Board pools all of the students together and randomly samples 250 students. Is this a simple
Random sample?
A) Yes, because the students were chosen at random.
B) No, because we can't guarantee that students from each school in the sample.
C) Yes, because each student is equally likely to be chosen.
D) No, because we can't guarantee that students from each grade in the sample.
E) Yes, because they could have chosen any 250 students from the district.

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The Answer of Suppose a school district decides to randomly test high school students for attention deficit
Disorder (ADD). There are three high schools in the district, each with grades 9-12. The school
Board pools all of the students together and randomly samples 250 students. Is this a simple
Random sample?
A) Yes, because the students were chosen at random.
B) No, because we can't guarantee that students from each school in the sample.
C) Yes, because each student is equally likely to be chosen.
D) No, because we can't guarantee that students from each grade in the sample.
E) Yes, because they could have chosen any 250 students from the district.

Suppose a School District Decides to Randomly Test High School