In a Poll of Students in Grades 6 Through 12

In a poll of students in grades 6 through 12, 13% reported that someone had seriously threatened to shoot them in the past year. This percentage was based on a sample of 2,508 students in 96 schools for which the principal had to give consent before the students could be surveyed. Give one possible explanation of why the sample may not have been representative of the population of all students in grades 6 through 12.

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The principals who taught in h...

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