Question

If three groups of unequal sizes have the same standard deviation but different means, will the SD of the pooled data be the same?

score 1.5k · Answer 1 · 2013-03-13 21:29:47

1.5k

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If three groups of unequal sizes have the same standard deviation but different means, will the SD of the pooled data be the same?

Published on 13 Mar 2013 - 21:29

score 516 · Answer 2 · 2026-03-28 07:38:35

516

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Calculating the standard deviation of the sum of a series of randomly distributed variables

Published on 28 Mar 2026 - 7:38

score 647 · Answer 3 · 2013-03-19 17:32:56

647

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Find standard deviation given standard deviation

Published on 19 Mar 2013 - 17:32

score 398 · Answer 4 · 2013-03-21 08:30:03

398

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Is there a better measure of variation for fractional numbers than standard deviation?

Published on 21 Mar 2013 - 8:30

score 651 · Answer 5 · 2013-03-27 04:44:48

651

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Statistics Question: Fixed revenue, variable costs

Published on 27 Mar 2013 - 4:44

score 262 · Answer 6 · 2020-08-05 01:15:16

262

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What does it mean that the variance of a vector is = 1?

Published on 05 Aug 2020 - 1:15

score 32 · Answer 7 · 2020-08-06 15:20:55

32

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How do I calculate the standard deviation here?

Published on 06 Aug 2020 - 15:20

score 298 · Answer 8 · 2026-03-27 07:17:07

298

Views

Show that $|\operatorname{median}(X) - \operatorname{mean}(x)| \leq \sigma_X$

Published on 27 Mar 2026 - 7:17

score 129 · Answer 9 · 2020-08-17 11:15:10

129

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Minimize variation of an equation system

Published on 17 Aug 2020 - 11:15

score 4.8k · Answer 10 · 2026-04-01 01:35:17

4.8k

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difference between $S^2$, $\sigma_x^2$. and $\sigma^2$?

Published on 01 Apr 2026 - 1:35

score 120 · Answer 11 · 2026-02-23 13:29:23

120

Views

Solving for median of $X$ where $X = 4Z-1$

Published on 23 Feb 2026 - 13:29

score 536 · Answer 12 · 2026-04-01 07:54:49

536

Views

Solving question of probability of X within one S.D. of mean

Published on 01 Apr 2026 - 7:54

score 496 · Answer 13 · 2026-04-01 07:50:45

496

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Normal Distribution question - Finding MEAN from given SD and Area

Published on 01 Apr 2026 - 7:50

score 184 · Answer 14 · 2026-02-23 15:05:14

184

Views

Why is the normal distribution defined exactly the way it is defined?

Published on 23 Feb 2026 - 15:05

score 63 · Answer 15 · 2020-08-30 09:44:54

63

Views

Should I take the std error of sampling distribution and calculate the z score?

Published on 30 Aug 2020 - 9:44

List Question

If three groups of unequal sizes have the same standard deviation but different means, will the SD of the pooled data be the same?

Calculating the standard deviation of the sum of a series of randomly distributed variables

Find standard deviation given standard deviation

Is there a better measure of variation for fractional numbers than standard deviation?

Statistics Question: Fixed revenue, variable costs

What does it mean that the variance of a vector is = 1?

How do I calculate the standard deviation here?

Show that $|\operatorname{median}(X) - \operatorname{mean}(x)| \leq \sigma_X$

Minimize variation of an equation system

difference between $S^2$, $\sigma_x^2$. and $\sigma^2$?

Solving for median of $X$ where $X = 4Z-1$

Solving question of probability of X within one S.D. of mean

Normal Distribution question - Finding MEAN from given SD and Area

Why is the normal distribution defined exactly the way it is defined?

Should I take the std error of sampling distribution and calculate the z score?

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