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19 A psychologist from Austin Texas interested in sleep s effect on the ability to...

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19 A psychologist from Austin Texas interested in sleep s effect on the ability to learn randomly selects high school students from the area s local high schools Half the students are randomly selected to sleep between 7 and 8 hours a night while the remaining half sleep as they normally would At the end of the study those students who got between 7 and 8 hours of sleep a night scored significantly higher on tests over the curriculum studied at their school From this the psychologist can conclude A Austin high school students getting between 7 and 8 hours of sleep per night score higher on tests over their curriculum B Students in the United States who get between 7 and 8 hours of sleep per night get better grades C Austin students who sleep between 7 and 8 hours per night get better grades D High school students getting between 7 and 8 hours of sleep per night score higher on tests over their curriculum E Since a placebo was not included in the study no significant conclusions can be made

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