We can be 99 % confident that the population variance for the percentage rate of home ownership is between 6.8305 and 140.0495. The only thing that is asked in return is to cite this software when results are used in publications. This free online software (calculator) computes the confidence intervals for the one-sided and two-sided hypothesis test about the population variance (for a given sample size, sample variance, and confidence interval). The formula to calculate this confidence interval is: Confidence interval = [√ (n-1)s 2 /X 2α/2, √ (n-1)s 2 /X 21-α/2] Standard Deviation Confidence Interval for Variance = [ (n-1)×S² / χ² α/2, n-1] ≤ σ² ≤ [ (n-1)×S² / χ² 1-α/2, n-1] Where, n = Sample Size S = Variance α = 1 - (Confidence Level/100) χ² α/2, n-1 = χ²-table value The calculation of standard deviation confidence interval for variance is made easier here. More about the confidence interval for the population variance. Source code of R module A confidence interval for a population standard deviation is a range of values that is likely to contain a population standard deviation with a certain level of confidence. Thus 99 % confidence interval for population variance is (6.83, 140.049). Please enter the necessary parameter values, and … A confidence interval is an statistical concept that refers to an interval that has the property that we are confident at a certain specified confidence level that the population parameter, in this case, the population standard deviation, is contained by it. Roughly speaking, every population parameter has a parametric expression to find a confidence interval. If you are interested in only one population variance, you can use this variance confidence interval calculator. The Confidence Interval Proportion calculation can be perfomed by the input values of confident interval … 99 % confidence interval estimate for population standard deviation is √6.83 ≤ σ ≤ √140.049 2.614 ≤ σ ≤ 11.834. Population Confidence Interval Calculator is an online statistics and probability tool for data analysis programmed to construct a confidence interval for a population proportion. Confidence Interval Calculator for the Population Mean This calculator will compute the 99%, 95%, and 90% confidence intervals for the mean of a normal population, given the sample mean, the sample size, and the sample standard deviation. confidence interval for standard deviation calculator,confidence interval for variance calculator