Question: 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 .

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