A researcher hypothesizes that undergraduate students who are satisfied with their lives will sleep less than those who are not satisfied. To test this hypothesis, she selects a sample of undergraduate students and asks them to maintain a “sleep log” (Drowsy, 1977), keeping track of the number of hours they sleep during each 24-hour period. These logs are maintained for two weeks. At the end of the two-week period, each participant completes the Satisfaction with Life Scale (Giggle & Smirk, 1969), a reliable, validated measure of general satisfaction with life.
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