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Provide an appropriate response. In constructing a confidence interval for σ or σ2, a table is...

Provide an appropriate response.

In constructing a confidence interval for σ or σ2, a table is used to find the critical values and  for values of n ≤ 101. For larger values of n, and   can be approximated by using the following formula: χ2 =  [± zα/2 +  ]2 where k is the number of degrees of freedom and zα/2 is the critical z score. Construct the 90% confidence interval for σ using the following sample data: a sample of size  yields a mean weight of 155 lb and a standard deviation of 26.0 lb. Round the confidence interval limits to the nearest hundredth.

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