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P2. Which design lets you see adaptation?
Only repeated measurement of the same people shows each person’s own change.
P4. In Kahneman and Deaton (2010), which measure kept rising with income?
Life evaluation kept rising; emotional well-being showed no further progress beyond about $75,000.
P6. Predictors A and B both have r = 0.30. Together they account for exactly 18% of the variation. True?
Overlapping predictors share variation, so the total is usually less than the sum.
P7. A survey finds that people who volunteer report higher satisfaction. Which is reverse causation?
Reverse causation reverses the arrow: satisfaction leads to volunteering.
P8. Which design best supports a claim that an intervention changed well-being?
Random assignment makes groups alike on average, so a difference can be attributed to the intervention.