Question # 1

If a and b are two constants then var (a+ bx) =

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± b var (x)

Var (a) ± var (x)

b² var (x)

(a±b) var (x)

In a set of "n" elements the total number of subsets are:

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2ⁿ

n²

n!

None of these

In chain base method,the base period is:

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Fixed

Changed

Constant

None of these

Number of ways a committee of 3 members can be selected from 5 members of a club is

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10

60

15

120

Most frequent value of the data is called:

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Mean

G.M

Mode

None of these

A complete list of elements in a population is called

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Population

Sampling design

Sampling frame

Sampling Unit

If 1- a = 0.90, then value of Z_a/2 is

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1.645

1.96

2.33

2.575

Second moment about mean is

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Zero

One

Standard Deviation

Variance

A graph of a cumulative frequency distribution is called:

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Frequency curve

Frequency polygon

Ogive

Histogram

The alternative hypothesis always contains the sign of

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Equality

Inequality

Ratio

Proportion

For a symmetrical distribution:

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b₁ = 0

b₁ = 3

b₂ = 3

b₃ = 3

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NAT I General Science Statistics MCQs With Answers

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