On May 21 2004 the National Center for Chronic Disease
On May 21, 2004, the National Center for Chronic Disease Prevention and Health Promotion, the Centers for Disease Control and Prevention, reported the results of the Youth Risk Behavior Surveillance— United States, 2003.The report split the sample of 15,184 American teenagers into grade levels as noted in the table that follows. The students admitted to carrying a weapon within the 30 days preceding the survey and to being in a physical fight during the past year. The following table summarizes two portions of the results.
Does the sample evidence show that students in grades 9 and 10 and grades 11 and 12 have different tendencies to carry weapons to school? Get into a physical fight? Use the 0.01 level of significance in each case.
a. Solve using the p-value approach.
b. Solve using the classical approach.
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