Sample size needed to get given ratio of endpoints for confidence interval of standard deviation in a normal distribution |
| |
| Authors: | Joanna Tarasińska |
| |
| Institution: | Department of Applied Mathematics and Computer Science, University of Life Sciences in Lublin, Lublin, Poland |
| |
| Abstract: | Confidence interval (CI) for a standard deviation in a normal distribution, based on pivotal quantity with a Chi-square distribution, is considered. As a measure of CI quality, the ratio of its endpoints is taken. There are given formulas for sample sizes so that this ratio does not exceed a fixed value. Both equally tailed and minimum ratio of endpoint CIs are considered. |
| |
| Keywords: | Confidence interval Normal distribution Sample size Standard deviation |
|
|
