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We are as well interested in estimating the population standard deviation, sigma (σ). We will again suppose that selling prices are close to being normally distributed. Below are selling prices from sixteen PDA's.

250 249 255 199 240 228 255 232
246 210 225 246 240 245 225 246

 Out to right, develop a 90% confidence interval estimate of sigma (σ), the population standard deviation.

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