Mathematics, 08.11.2019 04:31, Porciabeauty6788
An article in the national geographic news ("u. s. racking up huge sleep debt," february 24, 2005) argues that americans are increasingly skimping on their sleep. a researcher in a small midwestern town wants to estimate the mean weekday sleep time of its adult residents. he takes a random sample of 80 adult residents and records their weekday mean sleep time as 6.4 hours. assume that the population standard deviation is fairly stable at 1.8 hours. use table 1.
a.
calculate a 95% confidence interval for the population mean weekday sleep time of all adult residents of this midwestern town. (round intermediate calculations to 4 decimal places, "z" value and final answers to 2 decimal places.)
confidence interval to
b.
can we conclude with 95% confidence that the mean sleep time of all adult residents in this midwestern town is not 7 hours?
yes, since the confidence interval contains the value 7.
yes, since the confidence interval does not contain the value 7.
no, since the confidence interval contains the value 7.
no, since the confidence interval does not contain the value 7.
Answers: 3
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An article in the national geographic news ("u. s. racking up huge sleep debt," february 24, 2005) a...
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