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.