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Yet again, the old 10:1 rule.

Question 3. A stepwise solution yielded four variables: latency, total sleep time, total REM, and total time in stages 3 and 4. From those data, the researcher concluded that normal sleepers and insomniacs do not differ in the percentage of time they spend in REM and percent deep sleep. Was this correct?

Answer. We don't know. Since percent REM and percent deep sleep are probably correlated with the other variables, it is likely that they didn't enter into the equation because they didn't add any new information. Still, the groups could have differed significantly on these variables.

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