Question # 1

A part of the population is called

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parameter

statistic

sample

both b and c

A complete list of elements in a population is called

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population

sampling design

sampling frame

sampling unit

In the measurement of secular trend the moving averages:

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Give the trend in a straight line

Measure the seasonal variations

Smooth out a time series

None of these

The following statistic are unbiased estimators:

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The Sample mean

S² = Σ(X - X)²/n-1

The sample proportion

All the above

For a least squares linear trend=ŷ = a + bx, b is the

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variable

intercept

trend

slope

If (1-α) is increased, the with of a confidence interval is:

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Decreased

Increased

Constant

Same

In a normal distribution β₁ = 0 and β₂ = __________.

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2

4

3

5

Which error is occurred when the defendant were found guilty if, infect the defendant is innocent

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type-I

type-II

no error

both a and b

If r = -1, then there is

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negative correlation

perfect negative correlation

no correlation

average correlation

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6Σd₁

5Σd¹

The graph of a time series is called

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histogram

polygon

straight line

historigram

If X and Y are independent, then Cov(x,y) = 0 which implies that

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b_yx = 0

b_xy = 0

ρ = 0

a = 0

Degree of linear relationship between two variables is called

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regression

association

correlation

disassociation

A complete computer system has________ parts.

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2

3

4

5

A statistic on the basis of which a decision is made about the hypothesis of interest is called

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critical region

test statistic

parameter

rejection region

The elimination or addition of a few more time periods may change its

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speed

value

direction

none of these

The Level of ------------- of test is the maximum probability with which we are willing to a risk of type -I error

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correction

error

significance

statistics

Machine language is in the form of

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1 and 2

0 and 1

1 and 3

0 and 3

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