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a researcher is interested in the effects of watching videos just before bed on the quality...

a researcher is interested in the effects of watching videos just before bed on the quality of sleep. he has decided to test the claim. watching 1 hour of video just before going to bed reduces the number of minutes of REM sleep by more than 10% which of the following data collection processes would be appropriate? select only one answer choice

math   Statistics-And-Probability   
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