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In a random sample of 44 downloadable books from a website, the mean cost is $8.58 with a standard deviation of $2.09.

Which interval is the 95% confidence interval for the mean cost of all the downloadable books on the website?


($7.96, $9.20)


($7.77, $9.35)


($8.39, $8.77)


($8.26, $8.90)

 Mar 10, 2020

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