Question

Random variable X with mean $E(X)=7$ and $var(X)=6$. Calculate $E((X-a)^2)$?

score 138 · Answer 1 · 2018-02-21 21:53:34

138

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Random variable X with mean $E(X)=7$ and $var(X)=6$. Calculate $E((X-a)^2)$?

Published on 21 Feb 2018 - 21:53

score 83 · Answer 2 · 2018-02-22 16:15:44

83

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Variance of the sum of complex random variable

Published on 22 Feb 2018 - 16:15

score 3.4k · Answer 3 · 2026-03-25 01:18:36

3.4k

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How to simplify sum of $x_i Y_i$. where the sum of $x_i$ is a constant?

Published on 25 Mar 2026 - 1:18

score 100 · Answer 4 · 2018-02-24 14:24:32

100

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Double sum, how to proceed?

Published on 24 Feb 2018 - 14:24

score 66 · Answer 5 · 2018-02-24 17:28:16

66

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Mathematical Stats: Find the expectation and variance of a population if 40% are X and 60% are Y.

Published on 24 Feb 2018 - 17:28

score 15 · Answer 6 · 2026-03-06 23:21:01

15

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Variance Calculation for Var(a + (b^2)Y)

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score 185 · Answer 7 · 2018-02-24 23:05:57

185

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Moran process variance (discrete-time)

Published on 24 Feb 2018 - 23:05

score 84 · Answer 8 · 2018-02-25 15:08:08

84

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Variance of bottom card

Published on 25 Feb 2018 - 15:08

score 60 · Answer 9 · 2018-02-26 23:37:07

60

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$x_1, x_2, x_3, x_4,\ldots,x_k$ being random signs that are independent |-> $\operatorname{Var}(\sum_{k=1}^n b_k x_k) = \sum_{k=1}^n {b_k}^2$

Published on 26 Feb 2018 - 23:37

score 69 · Answer 10 · 2026-03-24 22:07:46

69

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Hint for computing the mean and variance of $\hat{\alpha} = - \frac{n}{\log \prod_{i=1}^n X_i }$

Published on 24 Mar 2026 - 22:07

score 996 · Answer 11 · 2026-03-25 02:59:33

996

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Calculation of variance beta hat

Published on 25 Mar 2026 - 2:59

score 2.2k · Answer 12 · 2026-03-25 01:16:18

2.2k

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Conditional Variance of the sum of two variables

Published on 25 Mar 2026 - 1:16

score 79 · Answer 13 · 2026-03-23 00:36:41

79

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Variance of Negative Binomial Distribution

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score 117 · Answer 14 · 2026-03-22 17:20:39

117

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Expected value of $[(x-\mu_x)^2 (y-\mu_y)^2]$?

Published on 22 Mar 2026 - 17:20

score 1.1k · Answer 15 · 2026-03-25 01:20:19

1.1k

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Prove VIF of jth predictor is jth diagonal entry of inverse of correlation matrix

Published on 25 Mar 2026 - 1:20

List Question

Random variable X with mean $E(X)=7$ and $var(X)=6$. Calculate $E((X-a)^2)$?

Variance of the sum of complex random variable

How to simplify sum of $x_i Y_i$. where the sum of $x_i$ is a constant?

Double sum, how to proceed?

Mathematical Stats: Find the expectation and variance of a population if 40% are X and 60% are Y.

Variance Calculation for Var(a + (b^2)Y)

Moran process variance (discrete-time)

Variance of bottom card

$x_1, x_2, x_3, x_4,\ldots,x_k$ being random signs that are independent |-> $\operatorname{Var}(\sum_{k=1}^n b_k x_k) = \sum_{k=1}^n {b_k}^2$

Hint for computing the mean and variance of $\hat{\alpha} = - \frac{n}{\log \prod_{i=1}^n X_i }$

Calculation of variance beta hat

Conditional Variance of the sum of two variables

Variance of Negative Binomial Distribution

Expected value of $[(x-\mu_x)^2 (y-\mu_y)^2]$?

Prove VIF of jth predictor is jth diagonal entry of inverse of correlation matrix

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