# Point Estimate and Confidence Intervals for SD

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A random sample of n = 9 wheels of cheese yielded the following weights in pounds, assumed to be

N(μ, σ^2):

21.50 18.95 19.40 19.15 22.35 22.90 22.20 23.10

(a) Give a point estimate for σ.

(b) Find a 95% confidence interval for σ and then find a 90% confidence interval for σ.

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##### Solution Summary

This solution provides steps necessary to determine the point estimate, confidence intervals and standard deviation.

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