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26 May, 09:42

Fred is constructing a 95% confidence interval to estimate the average length (in minutes) of movies he watches. His random sample of 15 movies averaged 114 minutes long with a standard deviation of 11 minutes. What critical value and standard error of the mean should he use?

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  1. 26 May, 09:46
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    Like what we suppose to do

    like adding all together?
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