Mathematics, 18.02.2022 19:40 Queenhagar
30 POINTS
To study the effect of cell phone use on the time it takes to fall asleep, two experimental treatments are planned: one-hour cell phone use before bedtime for one group versus two-hour cell phone use for another. Which of the following groups would serve best as a control for this study?
A third group that uses a cell phone randomly for one hour or two hours before bedtime
A third group that uses a cell phone for 30 minutes before bedtime
A third group that uses a cell phone only if awoken in the middle of the night
A third group in which each subject chooses to use a cell phone for one hour or two hours before bedtime
A third group that does not use a cell phone before bedtime
Answers: 1
Mathematics, 21.06.2019 16:30
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Mathematics, 21.06.2019 19:30
Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?
Answers: 1
30 POINTS
To study the effect of cell phone use on the time it takes to fall asleep, two experimen...
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