Correlation Test

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Correlation Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Correlation refers to

A
The association between two variables

B
The causal relationship between two variables

C
The proportion of variance that two variables share

D
None

Solution

Correlation between two variables shows how the two series are associated with each other. How one variable changes with the change in other
Question 2
1 / -0

If the coefficient correlation exactly equals to -1 then it will be effect

A
Negative correlation

B
Simple correlation

C
Multiple correlation

D
Positive correlation

Solution

Because a negative value of correlation indicates an inverse relation.
Question 3
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Following are the elements of correlation except

A
There should be three or more variables

B
The change in the value of one affects another

C
There should be only curvilinear relations among variables

D
There should be relationship among them

Solution

It is not necessary that there must be a curvilinear relation among variables,it can be linear or non linear correlation.
Question 4
1 / -0

Examples of negative correlation are

A
Increase in height and weight.

B
Age of husband and age of wife.

C
Demand for a commodity may go down as a result of rise in prices

D
The family income and expenditure on luxury items.

Solution

Negative correlation is said to exist when a rise in the value of one variable leads to a fall in the value of the other variable and vice versa.
Question 5
1 / -0

If D2 = 0 rank correlation is

A
1.0

B
0

C
0.5

D
-1

Solution

If it is so then the fraction part will be zero and when zero is subtracted from1 we will get 1.
Question 6
1 / -0

Following are the examples of positive correlation except

A
Sale of woollen garments and day temperature

B
Age of husband and age of wife.

C
Increase in height and weight.

D
Price of commodity and amount of supply

Solution

It is an example of negative correlation because with the rise in temperature the sale of woollen garments will fall.
Question 7
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Coefficient of correlation is also known as product moment correlation.

A
Spearman’s rank correlation.

B
None

C
Both

D
Karl Pearson’s coefficient of correlation.

Solution

As it is the product of two different random variables.also in denominator there is product of standard deviation.
Question 8
1 / -0

If cov(x,y) = 0 then

A
x and y are uncorrelated

B
x and y are linearly related

C
x and y are correlated

D
none

Solution

As correlation is zero, the variables are not related with each other
Question 9
1 / -0

If the plotted points in the plane form a band and they show a rising trend from the lower left hand corner to the upper right hand corner, then there is

A
High negative correlation

B
High positive correlation

C
Both

D
None

Solution

A band showing a rising trend from left to right indicates a close positive relationship and thus there is high positive correlation.

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Re-Attempt Weekly Quiz Competition

Correlation Test - 2

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Correlation Test - 2

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Question 1

The association between two variables

The causal relationship between two variables

The proportion of variance that two variables share

None

Solution

Question 2

Negative correlation

Simple correlation

Multiple correlation

Positive correlation

Solution

Question 3

There should be three or more variables

The change in the value of one affects another

There should be only curvilinear relations among variables

There should be relationship among them

Solution

Question 4

Increase in height and weight.

Age of husband and age of wife.

Demand for a commodity may go down as a result of rise in prices

The family income and expenditure on luxury items.

Solution

Question 5

1.0

0

0.5

-1

Solution

Question 6

Sale of woollen garments and day temperature

Age of husband and age of wife.

Increase in height and weight.

Price of commodity and amount of supply

Solution

Question 7

Spearman’s rank correlation.

None

Both

Karl Pearson’s coefficient of correlation.

Solution

Question 8

x and y are uncorrelated

x and y are linearly related

x and y are correlated

none

Solution

Question 9

High negative correlation

High positive correlation

Both

None

Solution

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