Correlation Test

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Correlation Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

If r is near to zero (i.e.) 0.1,-0.1, (or) 0.2 there is

A
less degree of correlation

B
high degree of correlation

C
Both

D
None

Solution

As the range of correlation is 0 to 1(less to high degree correlation)
Question 2
1 / -0

Coefficient of correlation is also known as product moment correlation.

A
Karl Pearson’s coefficient of correlation .

B
Spearman’s rank correlation.

C
Both

D
None

Solution

As it is the product of two different random variables.also in denominator there is product of standard deviation
Question 3
1 / -0

What is the range of simple correlation coefficient?

A
1< r < 1

B
1< r > 1

C
1> r > 1

D
-1< r < 1

Solution

Because the correlation between two variables can be negative or positive or no relation
Question 4
1 / -0

Which method of measuring correlation measures any type of relationship?

A
Karl Pearson’s coefficient of correlation

B
Spearman’s rank correlation.

C
Both

D
None

Solution

Only karl Pearson method shows relation between two variables and spearman correlation shows ordinal aspects of the variables
Question 5
1 / -0

If cov(x,y) = 0 then

A
x and y are correlated

B
x and y are linearly related

C
x and y are uncorrelated

D
none

Solution

As correlation is zero, the variables are not related with each other
Question 6
1 / -0

If D2 = 0 rank correlation is

A
0.5

B
1.0

C
0

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 7
1 / -0

Correlation coefficient is independent of change of

A
Origin

B
Origin and Scale

C
Scale

D
None

Solution

By change of scale we mean that all values of X and y series are multiplied or divided by some constant.by change of origin we mean that a constant is subtracted from all values of x and y series if the scale and origin of X and y series are changed the value of r remain unchanged
Question 8
1 / -0

Rank Correlation was found by

A
Pearson

B
Spearman

C
Galton

D
Fisher

Solution

In 1904, Charles Edward Spearman developed the formula to calculate coefficient of correlation of qualitative variables.
Question 9
1 / -0

The coefficient of correlation

A
Cannot be negative

B
Cannot be positive

C
Always positive

D
Can either be positive or negative

Solution

Because the two series can be related directly or Inversely.

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Re-Attempt Weekly Quiz Competition

Correlation Test - 3

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Correlation Test - 3

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SHARING IS CARING

Question 1

less degree of correlation

high degree of correlation

Both

None

Solution

Question 2

Karl Pearson’s coefficient of correlation .

Spearman’s rank correlation.

Both

None

Solution

Question 3

1< r < 1

1< r > 1

1> r > 1

-1< r < 1

Solution

Question 4

Karl Pearson’s coefficient of correlation

Spearman’s rank correlation.

Both

None

Solution

Question 5

x and y are correlated

x and y are linearly related

x and y are uncorrelated

none

Solution

Question 6

0.5

1.0

0

-1

Solution

Question 7

Origin

Origin and Scale

Scale

None

Solution

Question 8

Pearson

Spearman

Galton

Fisher

Solution

Question 9

Cannot be negative

Cannot be positive

Always positive

Can either be positive or negative

Solution

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