9/11 A study of about n = 1000 individuals in the United States during September 21–22, 2001, revealed that 43% of the respondents indicated that they were less willing to fly following the events of September 11, 2001.19
a. Is this an observational study or a designed experiment?
b. What problems might or could have occurred because of the sensitive nature of the subject? What kinds of biases might have occurred?
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