A researcher wants to study regional differences in dental care. He takes a multistage sample by dividing the United States into four regions, taking a simple random sample of ten schools in each region, randomly sampling three classrooms in each school, and interviewing all students in those classrooms about whether they’ve been to a dentist in the previous year. Identify each stage of this sampling design, indicating whether it involves stratification or clustering.
Answer to relevant QuestionsStudies show that marijuana is extremely popular among individuals who suffer from psychotic disorders such as schizophrenia. A recent study published in the British Journal of Psychiatry followed 80 marijuana smokers, 42 ...Repeat the previous exercise for the following scenarios: a. A principal in a large high school wants to sample student attitudes toward a proposal that seniors must pass a general achievement test in order to graduate. She ...Exercise 1.10 discussed a study at Yale University’s Infant Cognition Center. Researchers were interested in determining whether infants had the ability to distinguish between the actions of helping and hindering. Each ...A teacher announces a pop quiz for which the student is completely unprepared. The quiz consists of 100 true-false questions. The student has no choice but to guess the answer randomly for all 100 questions. a. Simulate ...An interview in an investment magazine (In the Vanguard, Autumn 2003) asked mathematician John Allen Paulos, “What common errors do investors make?” He answered, “People tend not to believe that markets move in random ...
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