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A new survey of more than 440,000 Americans finds that about a third of adults don’t...

A new survey of more than 440,000 Americans finds that about a third of adults don’t get enough sleep. About 65% of Americans get a “healthy” amount of sleep, or at least 7 hours a night, while 35% get less than 7 hours of sleep per night, according to the survey. I polled 10 friends and family about the number of hours of sleep they get a night, 4,7,8,3,6,6,5,7,6,6. Is mean value of the random sample less than the recommended number hours of sleep. Use α = 0.05 level of significance.

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Answer #1

as test statistic is in rejection region we reject null hypothesis

we have sufficient evidence to conclude that mean value of the random sample is less than the recommended number hours of sleep

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