population variance उदाहरण वाक्य

उदाहरण वाक्य

1. So for example an unbiased estimate of the population variance ( the second central moment ) is given by
2. For such small samples, a test of equality between the two population variances would not be very powerful.
3. Conversely, the sample variance is an unbiased estimate of the population variance, but is not Fisher consistent.
4. Mo et al . refined the idea by noting that the population variance of the feature should be taken into account.
5. The computational formula for the population variance follows in a straightforward manner from the linearity of expected values and the definition of variance:
6. The true distribution of the test statistic actually depends ( slightly ) on the two unknown population variances ( see Behrens Fisher problem ).
7. Under the assumption of equal population variances, the pooled sample variance provides a higher precision estimate of variance than the individual sample variances.
8. However, in the Behrens Fisher problem, the two population variances are not known to be equal, nor is their ratio known.
9. Estimating the population variance by taking the sample's variance is close to optimal in general, but can be improved in two ways.
10. The former can give an unbiased s _ p ^ 2 to estimate \ sigma ^ 2 when the two groups share an equal population variance.