Question # 1

When b_xy is positive, then b_yx will be _______.

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Negative

Positive

Zero

One

A region for which the H_o is rejected is called

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acceptance region

rejection region

critical region

both b and c

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37

132

32

cannot be calculated

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

Sample is a sub-set of ________.

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Population

Data

Set

Distribution

A statistical hypothesis is an assertion or conjecture about the distribution of random variables

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one

two

one or more

three

For a least squares linear trend Y = a + bx, the Σ(Y - Y)² = 0 when:

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All the Y-values are positive

All the Y-values lie on the line

All the Y-values lie above the line

None of these

A binary digit is commonly called:

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Byte

Kilobyte

Gigabyte

Bit

Small sample has less than

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50 values

45 values

30 values

35 values

The _______ regression line always passes through (X̅, y̅).

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Opposite

Estimated

Estimates

Random

The systematic components of time series which follow regular pattern of variations are called:

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Noise

Signal

Additive model

Multiplicative model

1 - α is the probability associated with:

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Type-I error

Type-II error

Level of confidence

Level of significance

The error which arises due to faulty sampling frames and processing of data is called

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random error

sampling error

non-sampling error

systematic error

In case of normal distribution maximum value of ordinate is

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μ

Zero

Joystick is an example of:

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Input devices

Output devices

Processing devices

Storage devices

The value of chi-square statistic is always _______.

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Negative

Non-negative

Zero

One

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b_yx

b_xy

S_p

The process of making estimates about the population parameter from a sample is called:

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Statistical independence

Statistical inference

Statistical hypothesis

Statistical decision

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