Question # 1

The value of the coefficient of correlation relies between__________.

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-1 and +1

0 and 1

-1 and 0

-0.5 and + 0.5

Confidence intervals which are often used in practice are

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90%

95%

98%

all of these

___________ is a set of electronic instructions:

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Hardware

Software

Hard disk

Compact disk

The difference of upper and lower limits of confidence interval measures the

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level of significance

level of confidence

interval

precision

The trend values in freehand curve method are obtained by:

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Equation of straight line

Second degree parabola

Signal

Graph

The distance between an estimate and the estimated parameter is called:

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Sampling error

Standard error

Bias

Error of estimation

The bias increases by increasing the sample_______.

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Unit

Number

Size

None of these

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

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variable

intercept

trend

slope

A complete list of elements in a population is called

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population

sampling design

sampling frame

sampling unit

Large sample contains more than

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5 values

10 values

20 values

30 values

For normal distribution mean always lies between.

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Median and mode

Median and Q₁

Median and Q₃

None of these

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biased

unbiased

positively biased

none of these

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

Regression line x on y is

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For a least squares linear trend Y = a + bX

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ΣY = ΣY

ΣY = 0

ΣY > ΣY

None of them

1 kb = _____________ bytes

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10

100

1000

10,000

P(μ-2σ < X=< μ + 2σ)=

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0.6827

0.9545

0.9973

0.9827

The probability distribution of proportions is called

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proportional distribution

population distribution

sample distribution

sampling distribution

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