# Confidence level for variance

You randomly select and measure the contents of 10 bottles of cough syrup. The results (in fluid ounces are shown.

4.216 4.292 4.252 4.244 4.186

4.281 4.269 4.243 4.222 4.231

Assume the sample is taken from a normally distributed population. Construct 98% confidence intervals for (a) σ2 the population variances and (b)the population standard deviation σ.

a)The confidence interval for the population variance is ( ___,___)

b)The confidence interval for the population standard deviation is ( ___,___)

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#### Solution Preview

Statistics

You randomly select and measure the contents of 10 bottles of cough syrup. The results (in fluid ounces are shown.

4.216 4.292 4.252 4.244 4.186 4.281 4.269 4.243 4.222 4.231

Assume the sample is taken from a normally distributed population. Construct 98% confidence ...

#### Solution Summary

Step by step method for computing confidence interval for variance and standard deviation.