18. Because there is so much variation among individuals in terms of personal characteristics and because human resource

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18. Because there is so much variation among individuals in terms of personal characteristics and because human resource managers generally only have a limited amount of information to predict the performance of each job candidate, HR needs to have confidence in the information it does gather (1.e., accuracy). For these reasons, the reliability and validity of the selection tools used to make hiring decisions are critical considerations. Define both reliability and validity (including both content and empirical validity), noting why you need both