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2) A random sample of 25 observations was selected from a normally distributed population. The average in the sample was 84.6 with a variance of

2) A random sample of 25 observations was selected from a normally distributed population. The average in the sample was 84.6 with a variance of 400. (30 points) a). Construct a 90% confidence interval for . b). Construct a 99% confidence interval for .

Show on excel sheet. I am having trouble creating the excel sheet for these equations. Please attach a excel picture if possible to show how this information should look in excel.

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