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In a series of 2n observations, half of ...

In a series of 2n observations, half of them equal to a and remaining equal to b. If the standard deviation of the observations is 2, then |a| equals :

A

`(sqrt2)/n`

B

`sqrt2`

C

2

D

1/n

Text Solution

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The correct Answer is:
C
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HIMALAYA PUBLICATION-STATISTICS MEASURE OF DIPERSION-QUESTION BANK
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  3. Let a, b, c, d, e be the observations with mean m and standard deviati...

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  6. Standard deviations for first 10 natural numbers is :

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  7. Consider the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. If 1 is added to e...

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  8. The following information relates to a sample of size 60 : sum x^(2) =...

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  9. Coefficients of variation of two distributions are 50 and 60, and thei...

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  10. The standard deviation of some temperature data in overset C is 5. If...

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  11. In an experiment with 15 observations on x, the following results were...

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  12. In a series of 2n observations, half of them equal to a and remaining ...

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  13. Suppose a population A has 100 observations 101, 102, …., 200 and anot...

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  14. If the mean deviation of the numbers : 1, 1 + d, 1 + 2d, ….., 1 + 100d...

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  15. For two data sets, each of size 5, the variances are given to be 4 and...

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  16. The sum of the squares of deviations for 10 observations taken from th...

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  18. The S.D. of 5 scores 1, 2, 3, 4, 5 is :

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  19. The variance of the first n natural numbers is :

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