List questions from variance

Published on 27 Feb 2023 - 3:15

63

Views

Variance of random matrix?

Published on 25 Mar 2026 - 20:41

54

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Sum of variances of 2 correlated random variables

Published on 27 Feb 2023 - 14:48

38

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Variance of Variance -> Confidence Interval?

Published on 27 Mar 2026 - 23:40

65

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Solving the variance of a compound pdf

Published on 01 Apr 2026 - 1:19

74

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Will the variance of some imaginary variable be negative?

Published on 03 Mar 2023 - 1:55

65

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${\rm Cov}(X,Y)=1/4 \times ({\rm Var}(XY)-{\rm Var}(X/Y))$

Published on 04 Mar 2023 - 23:22

61

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Find var$(\overline{X_n}^2)$ given that $EX_1=\mu,E(X_1-\mu)^k=\alpha_k$

Published on 29 Mar 2026 - 4:34

53

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Show that $\mathbb{V}(\bar{X})=\frac{\sigma^2}{n}$

Published on 29 Mar 2026 - 4:34

24

Views

Variance of sum of dependent Random Variables

Published on 08 Mar 2023 - 21:12

92

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Why doesn't the sample variance become the population variance when the sample has the whole population

Published on 09 Mar 2023 - 15:17

71

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Dot product between 2 random vectors

Published on 13 Mar 2023 - 21:22

64

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Standard Deviation of 4 Game Series

Published on 29 Mar 2026 - 18:33

27

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A random sample of $50$ machines obtained that its average life is $\bar{x}=70$ months with a variance of $s^2=49$. Confidence interval for variance.

Published on 24 Feb 2026 - 19:58

236

Views

How does the Covariance matrix encode rotations?

Published on 16 Mar 2023 - 11:35

List Question

Expectation and Variance of Infinite Sum

Variance of random matrix?

Sum of variances of 2 correlated random variables

Variance of Variance -> Confidence Interval?

Solving the variance of a compound pdf

Will the variance of some imaginary variable be negative?

${\rm Cov}(X,Y)=1/4 \times ({\rm Var}(XY)-{\rm Var}(X/Y))$

Find var$(\overline{X_n}^2)$ given that $EX_1=\mu,E(X_1-\mu)^k=\alpha_k$

Show that $\mathbb{V}(\bar{X})=\frac{\sigma^2}{n}$

Variance of sum of dependent Random Variables

Why doesn't the sample variance become the population variance when the sample has the whole population

Dot product between 2 random vectors

Standard Deviation of 4 Game Series

A random sample of $50$ machines obtained that its average life is $\bar{x}=70$ months with a variance of $s^2=49$. Confidence interval for variance.

How does the Covariance matrix encode rotations?

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