A researcher wanted to conduct a survey of major companies to find out what benefits are offered to their employees. She mailed questionnaires to 2500 companies and received questionnaires back from 493 companies. What kind of systematic error does this survey suffer from? Explain.
Answer to relevant QuestionsBriefly explain the types of statistics. In March 2005, the New England Journal of Medicine published the results of a 10-year clinical trial of low-dose aspirin therapy for the cardiovascular health of women (Time, March 21, 2005). The study was based on 40,000 ...A pharmaceutical company developed a new medicine for compulsive behavior. To test this medicine on humans, the company advertised for volunteers who were suffering from this disease and wanted to participate in the study. ...A researcher sent out questionnaires to 5000 randomly chosen members of HMOs (health maintenance organizations). Only 1200 of these members completed their questionnaires and returned them. Seventy-eight percent of the ...A professor wanted to select 20 students from his class of 300 students to collect detailed information on the profiles of his students. He used his knowledge and expertise to select these 20 students. a. Is this sample a ...
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