Question # 1

The most suitable average for index numbers is:

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Arithmetic mean

Geometric mean

Harmonic mean

Median

By decreasing ×̅ the length of confidence interval for m

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Increases

Decreases

No effect

None of these

The probability of an event can never be

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Zero

1

0.5

Negative

Most frequent value of the data is called:

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Mean

G.M

Mode

None of these

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

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1.645

1.96

2.33

2.575

A fair coin is tossed four times the prob.of getting four heads is:

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1/4

1/2

1/16

1

The sum of deviations from arithmetic mean is:

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0

5

a

1

Sum of dots when two dice are rolled is:

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Discrete variable

continuous variable

Constant

Qualitative variable

The index numbers calculated by considering the relative importance of variables are called:

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Un-weighted

Weighted

Simple

None

If var (x) =5, var(y) =10, then var (2x + y) is:

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10

15

30

25

If Y = -5 -8x and S.D.(X) =3,then S,D (Y) =

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24

8

5

-24

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