# Critical value and standard deviation

Please see the attached file.

Determine the 2 chi-squared critical values for the following confidence levels and sample sizes.

We are also interested in estimating the variation for the PDA selling prices through examination of the standard deviation, sigma (σ). We will again assume that selling prices are close to being normally distributed. Below are the selling prices from the sixteen PDA's sampled.

https://brainmass.com/statistics/dispersion-and-spread-of-data/critical-value-and-standard-deviation-178636

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$2.19