Question: What is the difference between a sample and a population? How can researchers reduce participant attrition? How do researchers measure the reliability of an instrument?

What is the difference between a sample and a population? How can researchers reduce participant attrition? How do researchers measure the reliability of an instrument? What is validity and why is it important in evaluating psychometric instruments? What criteria should researchers use to evaluate measurement tools? How can researchers assure the accuracy of a physiologic measure? How is the precision of a physiologic measure assessed? What are the elements of a data collection plan

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