Biology, 29.08.2020 23:01 lucyamine0

You want to know if the average number of hours slept at night affects a person's GPA. You ask 3 friends to record the hours they sleep for a week, and then you compare their GPA's. To make this
study better (more valid) you should
collect sleep data for more than 1 week
choose people randomly, not just your friends
Ο Ο Ο Ο
all of these are correct
get data from more people

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