Perhaps you have been asked this question: Did you get your 8 hours of sleep last night?

Question:

Perhaps you have been asked this question: “Did you get your 8 hours of sleep last night?” In a recent survey of 151 postpartum women, the folks at the National Sleep Foundation found that the mean sleep time was 7.8 hours, with a standard deviation of 1.4 hours. Does the evidence suggest that postpartum women do not get enough sleep? Use α = 0.05 level of signiﬁcance.