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Construct an 80% confidence interval for the population standard deviation if a sample of size 7...

Construct an 80% confidence interval for the population standard deviation if a sample of size 7 has standard deviation s=10.5. Round the answers to at least two decimal places.

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Answer #1

Gicen " Sample size=n=7

Sample standard deviation=s=10.5

Significance level=0.20

Therefore , the 80% confidence interval for the population standard deviation is ,

Where , , The Excel function is , =CHIINV(0.10,6)

, The Excel function is , =CHIINV(0.90,6)

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