Here, we are interested in developing a test that predicts success as a chef 10 years down the line. To establish the predictive validity of the COOK test, you go to recent graduates of the program and administer the test to them. Then, wait 10 years. Measure them again on a different but related criterion, such as their level of success, and you use as measures (a) whether they own their own restaurant and (b) the restaurant’s average rating on social media. The rationale here is that if a restaurant has good ratings, then the chef must be doing something right. To complete this exercise, you
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