An observational study involves collecting data about persons or objects by recording information about their selected characteristics of interest.
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Q1: In designing a survey,demographic questions must be
Q2: A self-selected sample is one in which
Q3: Which of the following statements is true
Q4: "Wouldn't you agree that foreign cars are
Q5: In a(n)_ study,individuals are randomly assigned to
Q7: Which method of data collection is involved
Q8: A marketing research firm selects a random
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