Question # 1

The difference between largest and smallest observation is called

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Interval

Class interval

Range

Difference

Range can be calculated in open-end classes.

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Never

Always

Often

Seldom

Which of the following statements is correct.

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Every symmetrical curve is measokurtic

Standard deviation is the mean squared deviations from the mean

The standard deviation of a constant is constant

Teh second moment about zero equals variance.

Why is it necessary to square the difference from the mean when computing the standard deviation.

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So that the extreme values will not affect the calculation

Some of the differnece will be positive and some will e negative

It can change drastically from one data set to the next

It is determined by only two points in the data set

If b₂ = 3, then the distribution is:

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leptokurtic

Platykurtic

Normal

None of these

The compare the variation of two or more than two sereies, we use.

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Mean absolute deviation

Variance

Coefficient of viariation

Corrected atandard deviation

First central moment is always.

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0

1

-1

2

Second moment about mean is called

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Standard deviation

Mean deviation

Variance

Coefficient of variation

The sum of the squares of deviations is the least when measured from.

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A.M

Median

Mode

Both A and B

Relative depression is of types.

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1

4

3

2

The variance of constant is always

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Constant

One

Positive

Zero

For a symmetrical distribution.

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B1 = 0

B1 = 3

B2 = 3

B3 = 3

The main advantages of using the range as a measure of dispersion is that.

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It is easy to calculate

It is heavily influenced by extreme values.

It can change drastically from one data set to the next

It is determined by only two points in the data set

test2

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3

4

2

In measure of relative dispersion unit of measurement is.

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Changed

Vanishes

Does not vanishes

None of these

The S.D. of 8,8,8,8,8, is.

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8

(8)²

zero

5

Teh range of the value -2, -4, -6 and -8 is.

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-6

6

-10

-4

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