1) ADHD or Just Young? Were you one of the youngest or one of the oldest in your class in elementary school? A new study examines whether the youngest children in a school grade are more likely to be diagnosed with attention-deficit/hyperactivity disorder (ADHD) than their older peers in the same grade. The study involved almost a million children between the ages of 6 and 12 in British Columbia, Canada. The cutoff date for entering school in Canada is December 31, so those born in January are the oldest in any given class and those born in December are the youngest. The table below shows the number of boys diagnosed with ADHD based on the quarter of the year in which they were born. The table also shows the proportion of all births during that quarter. Is it possible that younger students are being over-diagnosed with ADHD? Perform the appropriate x? test. State your parameters of interest, show your expected counts, your null and alternative hypotheses, your test statistic x? , and your p-value. Then write an appropriate conclusion. Birth Date Proportion of Births ADHD Diagnoses 6880 7982 Jan - Mar Apr- Jun Jul - Sep Oct - Dec 0.244 0.258 9161 0.257 8945 0.241

1) ADHD or Just Young? Were you one of the youngest or one of the oldest in your class in elementary school? A new study examines whether the youngest children in a school grade are more likely to be diagnosed with attention-deficit/hyperactivity disorder (ADHD) than their older peers in the same grade. The study involved almost a million children between the ages of 6 and 12 in British Columbia, Canada. The cutoff date for entering school in Canada is December 31, so those born in January are the oldest in any given class and those born in December are the youngest. The table below shows the number of boys diagnosed with ADHD based on the quarter of the year in which they were born. The table also shows the proportion of all births during that quarter. Is it possible that younger students are being over-diagnosed with ADHD? Perform the appropriate x? test. State your parameters of interest, show your expected counts, your null and alternative hypotheses, your test statistic x? , and your p-value. Then write an appropriate conclusion. Birth Date Proportion of Births ADHD Diagnoses 6880 7982 Jan - Mar Apr- Jun Jul - Sep Oct - Dec 0.244 0.258 9161 0.257 8945 0.241

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Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.5: Interpreting Data

Problem 1C

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