ELEMENTS OF STATISTICS, SET 10

ELEMENTS OF STATISTICS

Q.1

What will be mean of squares of first n natural numbers ?

Ans. 

n (n+1) (2n+1) / 6n.

Q.2

If in a frequency distribution, the maximum frequency is being repeated, then the value of mode can be ascertained by

Ans. 

Method of grouping.

Q.3

The lack of homogeneity in the size of distribution is called

Ans. 

Dispersion.

Q.4

Such measure of dispersion which is affected least by fluctuation of sampling.

Ans. 

Standard deviation.

Q.5

Standard deviation is independent of __ and depends on __.

Ans. 

Change of origin, change of scale.

Q.6

The measure of Kurtosis is

Ans. 

β₂ and γ₂.

Q.7

If the Kurtosis of a distribution is less than 3, then it is called

Ans. 

Platycurtic curve.

Q.8

If the Kurtosis of a distribution is more than 3, it is said to be __ curve.

Ans. 

Leptocurtic.

Q.9

What is the probability of an impossible event ?

Ans. 

Zero.

Q.10

What is the name of the limiting relative frequency approach probability ?

Ans. 

Statistical probability.

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