Variance+Confidence+Intervals

Variance Confidence Intervals (Confidence Intervals) (GWU EMSE-271)
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"Estimator distributions are important to determine confidence intervals." - EMSE 271, Fall 2009 (Slides 68-70)

Certainty is described by the Chi-squared distribution; can calculate points; such as the 5th and 95th percentiles. There is 90% in between. The display graphically the two-side confidence interval that the random interval captures the constant sigma-squared 90% of the time. Sigma-squared is or is not in the interval.

Second slide shows how to compute. Look the voltage.xls spreadsheet to see.




 * Sources:**
 * EMSE 271, Fall 2009 (Slides 70-71)