After a number of incidents, American Airlines decided to increase its security. American Airlines wanted to know if the new security measures affected travelling, so after the measures had been in place for three years, the airline compared to number of miles flown by repeat travelers before and after the security change. Is this a prospective or retrospective study? What type of statistical test could you use to evaluate the hypothesis?

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For prospective study data is recorded over time as their characteri... View the full answer