Question # 1

Which one of the following is an example of seasonal variation

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An increase in consumption of electricity in summer

A steel strike, delaying production for a week

A continually increasing demand for smaller automobiles

None of these

The variance of a constant is

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Constant

Zero

One

None of these

The branch of statistics concerned with using probability concepts to deal with uncertainty in decision making is called

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Estimation

Statistical Inference

Point estimate

None of these

When a pair of dice is rolled, the sample space consists of

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6 outcomes

36 outcomes

12 outcomes

24 outcomes

When each outcome of a sample space is as likely to occur as any other, the outcomes are called

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Mutually exclusive

Exhaustive

Equally likely

None of these

If any value in the data set is zero, then it is not possible to compute

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H.M

A.M

Median

Mode

For a particular test, alpha = 0.05 and beta = 0.10. The power of this test is

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0.15

0.90

0.85

0.95

Probaility of an event cannot be

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Positive

One

Negative

None of these

In symmetrical distribution, mean, median and mode are

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Equal

Different

Zero

None of these

Primary data and ungrouped data are

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Same

Opposite

Not same

Proportional

The arrangement of data in order of magnitude is called

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Order statistic

Parameter

Ratio

Parameters

The hypergeometric model is applied when samples are taken or selections are made, from a finite population

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With replacement

Without replacement

With parameters

None of these

In the study of two attributes, (B) =

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(Aβ) + (αB)

(AB) + (Aβ)

(B) + (β)

(AB) + (αβ)

A fire in a factory delaying production for 3 weeks is an example of

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Seasonal variation

Secular Trend

Cyclical fluctuations

Irregular Movements

The collecting of information from a part of the population is called making a

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Census

Complete enumeration

Discrete sampling

None of these

The height of students, between 5.0 and 5.9 feet, is an example of

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Discrete variable

Continuous variable

Constant

Parameter

Quantities which don't vary from individual to individual are called

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Variables

Surveys

Constant

Parameters

Selecting a representative sample from a given population called

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Finite population

Sampling

Infinite population

None of these

First-hand collected data is called

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primary data

secondary data

grouped data

ungrouped data

The probability density function of a continuous random variable Y is specified by a

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straight line

Rectangle

Smooth curve

Circle

The degree of relationship between the two attributes is called

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Association

Dichotomy

Variable

None of these

If "a" and "b" are constants, then E(ax + b) =

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a

a E (x)

E (x)

a E (x) + B

The difference between the highest and lowest values in a population is called

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Range

Variance

Mean deviation

Standard deviation

The purpose of simple linear regression analysis is to

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Replace points on a scatter diagram by a straight line

Measure the degree to which two variables are linearly associated

Predict one variable from another vaiable

None of these

A ___________ is a line or curve that shows the general tendency of a time series.

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Historigram

Seasonal variation

Secular Trend

None of these

The seasonal variations are

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Long term movements

Short term movements

Cyclical fluctuations

Secular trend

The number used to describe classes in a frequency distribution are called

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Class limits

Relative frequency

Cumulative frequency

Width of class

If the critical region is located equally in both tails of the sampling distribution of test statistic, the test is called a

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Two tailed test

One tailed test

Right tailed test

Left tailed test

__________ is a measure of number of vibration per second

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Frequency

Speed

Hertz

Bytes

The difference between the expected value of a statistic and the true value of the parameter being estimated is called

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Accuracy

Error

Precision

Bias

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