1) Identify the type of observational study (cross-sectional, retrospective, or prospective) and explain the reason for your selection: A group of physicians studied New York City residents with and without respiratory problems. They went back in time to determine how involved they were in the New York City terrorist attacks on September 11, 2001.
1) Identify the type of observational study (cross-sectional, retrospective, or prospective) and explain the reason for your selection: A group of physicians studied New York City residents with and without respiratory problems. They went back in time to determine how involved they were in the New York City terrorist attacks on September 11, 2001.
1) The company Spanish Publications has commissioned you to carry out a survey of 100 student users of its Spanish book. Describe the procedures for obtaining a random sample.
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The company Spanish Publications has commissioned you to carry out a survey of 100 student users of its Spanish book. Describe the procedures for obtaining a random sample.
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