Refer to Exercise 10. Use the more accurate normal approximation to estimate the critical values 2

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Refer to Exercise 10. Use the more accurate normal approximation to estimate the critical values χ2100, 0.025 and χ2100, 0.975 for a 95% confidence interval, and construct a 95% confidence interval for σ.

Refer to Exercise 10.

A sample of size 101 from a normal population has sample standard deviation s = 40. The lower and upper 0.025 points of the χ2100 distribution are χ2100, 0.975 = 74.222 and χ2100, 0.025 = 129.561. Use these values to construct a 95% confidence interval for σ.

Distribution
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