Mathematics, 14.12.2019 03:31 stussy44
According to a recent survey, americans get a mean of 7 hours of sleep per night. a random sample of 50 students at west virginia university revealed the mean length of time slept last night was 6 hours and 48 minutes (6.8 hours). the standard deviation of the sample was 0.9 hours.
at the 5% level of significance, is it reasonable to conclude that students at west virginia sleep less than the typical american?
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