Question # 1

If X and Y are random varaibes, than E ( X - Y) is equal to.

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E(X) + E (Y)

E(X) - E(Y)

X - E (Y)

E(X) - Y

if X and Y are independent random varaibesl the S.D. (X-Y) is equal to

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Var (X) - var (Y)

Var (X) + Var (Y)

E(X-Y)2

E(X + Y)2

The probabilyt that a continous random varaibe 'x ' takes on specific value of x is.

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Greater thaan zero

Less than zero

Equal to Zero

0 to 1

The expected value of a discrete random variable is.

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Always an integer

Always one of the values that the random variable can assume

An interal of values

None of these

In binomial distribution, the random variable has a range:

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0,1,2...................n

0,1,2,......+∞

-∞ to +∞

∞ to +0

When X denotes the number of success in binomial experiment, it is called.

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Random variable

Binomial random variable

Continuous random variable

Both (B) and (C) but not (A)

An expected value of a random variable is equal to its.

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Variance

B.D.

Mean

Co - Variance

The probability of success changes from trial to trial, is the property of:

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Binomial experiment

Hypergeometric experiment

Both A and B

None of these

If X and Y are independent random variables , the E (XY) is equal to.

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E(XY)

E(X) E(Y)

XE(Y)

YE(X)

Binomial distribution is used when n is

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Large

Small

Negative

Zero

the discrete probability distributio may be represented by.

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A table

A graph

A mathematical equation

All of these

The binomial distribution is symmetrical when:

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P > q

p = 1/2

Probability of success & probability of failure are equal

Both (B) and (C)

Random number can be generated manully by

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Dawing cards from numbered cards

Roitaing or spinning numbered wheels

Use of random numbers table

All of these

If x is a continuous random vriable, then the function f (x) is.

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A probability function

A probability denaity function

A density function

Both b and c

The number of possible outcomes in Bernoulli trial is

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Three

Four

Two

One

Hypergeometric distribution is a

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Continuous distribution

Discrete distribution

Simple distribution

Normal distribution

Which of the following distribution(s) has 3 parameters.

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Binomial distribution

Hypergeometric distribution

Both of the above

None of these

If x is discrete random variable, then the function f (x) is.

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A probability function

A density function

A probability density function

A distribution function

When x denotes the number of success in binomial experiment it is called.

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Random variable

Binomial random variable

Continuous random variable

Both (B) and (C) but not (A)

Random numbers are generated from the single digit numbers.

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{ 1,2,3,............. 10 }

{ 0, 1,2,.......................... 10}

{ 0,1,2.............}

{0,1,2,............. 9}

Each trial of binomial experiment results in an outcome which can be classified in two categories

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Head or tail

Ace or six

Success and failure

None of these

Which of the following case is true for hypergeometric distribution.

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Probability remains constant for all trials

Probability changes

successive trials are dependent

Both (B) and (C) but not (A)

The repeated trials of binomial experiments are

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Dependent

Independent

Fixed

Variable

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