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You know that y is a normally distributed variable with a variance of 16. You do not know its mean. You collect some data. For 

You know that y is a normally distributed variable with a variance of 16. You do not know its mean. You collect some data. For each sample below, form the 90% confidence interval and test the null hypothesis of the mean equaling 5. a. (8,1,5)  b. (8,1,5,-4,-8,4,8,5)

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