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anonymous
 one year ago
Suppose the average annual expense for a random sample of 12 stock funds is normally distributed with mean of 1.63 percent with a standard deviation of .31 percent. Calculate a 95 percent confidence interval for the mean annual expense charged by all stock funds.
anonymous
 one year ago
Suppose the average annual expense for a random sample of 12 stock funds is normally distributed with mean of 1.63 percent with a standard deviation of .31 percent. Calculate a 95 percent confidence interval for the mean annual expense charged by all stock funds.

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kropot72
 one year ago
Best ResponseYou've already chosen the best response.1The confidence interval is found by plugging the given values into the following: \[\large (\bar{x}1.96\frac{\sigma}{\sqrt{n}},\ \bar{x}+\frac{\sigma}{\sqrt{n})})\]

kropot72
 one year ago
Best ResponseYou've already chosen the best response.1Giving: \[\large CI=(1.631.96\frac{0.31}{\sqrt{12}},\ 1.63+1.96\frac{0.31}{\sqrt{12}})=you\ can\ calculate\]

kropot72
 one year ago
Best ResponseYou've already chosen the best response.1@work12345 Are you there?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@kropot72 thanks a lot for your help! Sorry about that, I left my computer after waiting awhile on this question.
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