Question # 1

Which of the following measures of dispersion is independent of the units employed.

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Standard deviation

Quartile deviation

_{Coefficient of variation}

Variance

For a constant k, the variance of k is

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zero

k²

k

none of these

Mid poitn of the group. 5.5 - 7. 5 in

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6

6.5

7

7.5

Index number of the year text to the base year can be shown as

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Q_n

Q_on

Q₀₁

Q_oi

The most central value of an arrayed data is.

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Mode

Median

Mean

Harmonic mean

A student soved 25 questions from first 50 questios of a book to be solved. The prob, that he will solve the remaining all questions.

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0.25

0.51

1

0

In a symmetrical distribution, the coefficient of skewness will always be.

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Negative

zero

1

-1

Circular test is satisfied by

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Laspeyres index

Paasche's index

Fisher's method

None of these

Which of the following statements is true.

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As a rule statisticians genereally use between 6 and 15 classes.

As a rule, statisticians regards a frequency distribution incomplete if it has fewer than 20 classes.

Classes describe only one characteristics the data ebign organized

None of these

If the random variable X denotes the number of heads when three distinet coins are tossed,then X assumes the value.

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0.1.2.3

1,3,3,1

1,2,3

None of these

If a curve can be divided into two parts that are marror images,it is called a.

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Skewed curve

Symmetrical curve

J-Shaped curve

Frequency curve

Random variable is also called ___________.

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Chance stochasitc

Coverges

Random

None of these

the phase of statistics that is concerned with the procedures and methodology for obtaining valid conclusions is called.

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Descriptive staticis

Deductive statistics

Inferential statistics

Sample statistics

If mean = 25 and variance is also 25, then coefficient of variation is

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100%

25%

20%

10%

If x is a random variable with E(x) = 5 then E(3x - 2) =

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0

1

13

All of them

For a moderately skewed dsitribution, whihc of the following emprical formula holds.

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M.D. = 4/5(S.D)

Q.D. = 2/3 (S.D)

Q.D . = 5/6 (M.D.)

All of these

There sets on a sofa can be occupied by four persons in.

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12 ways

7 ways

24 ways

None of these

Binomial distribution is negatively skewed if.

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p < q

p > q

p = q

np = npq

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