Correlation Test

Result

Correlation Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

The coefficient of correlation

A
Cannot be positive

B
Always positive

C
Cannot be negative

D
Can either be positive or negative

Solution

Because the two series can be related directly or Inversely.
Question 2
1 / -0

Which of the following indicates the strongest relationship?

A
r = .08

B
r²= .2

C
r = - .6

D
r = .5

Solution

The highest score shows high degree of correlation. It can be positive or negative.
Question 3
1 / -0

If the plotted points in the plane are spread all over the diagram, then there is

A
No correlation

B
Highly Positive correlation

C
Highly Negative correlation

D
None

Solution

Data points scattered all over the diagram indicate no association between the two variables and hence there is no correlation.
Question 4
1 / -0

If two variables oppose each other then the correlation will be

A
No Correlation

B
Positive Correlation

C
Perfect Correlation

D
Negative Correlation

Solution

Negative correlation implies that high value of one variable will correspond to a low value of another variable and vice versa.
Question 5
1 / -0

Two variables are said to be positively correlated when with _____ in the value of one variable, the value of other variable also _____

A
Rise , Falls

B
No change, Rises

C
Fall, Rises

D
Fall , falls

Solution

Positive correlation implies that both the variables will move in the same direction, either both will rise or both will fall.
Question 6
1 / -0

If two variables are highly correlated, what do you know?

A
That there are no other variables responsible for the relationship

B
That changes in one variable are accompanied by predictable changes in the other

C
That they always go together

D
That high values on one variable lead to high values on the other variable

Solution

High degree of correlation implies that there is a strong relationship between the two variables and that the changes in one variable cause predictable changes in the other variable.
Question 7
1 / -0

The Spearman correlation is used with

A
Ordinal data

B
Nominal data

C
Interval data

D
Ratio data

Solution

Spearman's rank correlation is used for ordinal data, where the values have not been measured but have been ranked.
Question 8
1 / -0

The nature of correlation for shoe size and IQ is _________

A
Linear

B
Non-linear

C
No correlation

D
None

Solution

There is no relationship between the shoe size of a person and his IQ and therefore there is no correlation
Question 9
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

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Re-Attempt Weekly Quiz Competition

Correlation Test - 1

Result

Correlation Test - 1

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Rank

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SHARING IS CARING

Question 1

Cannot be positive

Always positive

Cannot be negative

Can either be positive or negative

Solution

Question 2

r = .08

r2 = .2

r = - .6

r = .5

Solution

Question 3

No correlation

Highly Positive correlation

Highly Negative correlation

None

Solution

Question 4

No Correlation

Positive Correlation

Perfect Correlation

Negative Correlation

Solution

Question 5

Rise , Falls

No change, Rises

Fall, Rises

Fall , falls

Solution

Question 6

That there are no other variables responsible for the relationship

That changes in one variable are accompanied by predictable changes in the other

That they always go together

That high values on one variable lead to high values on the other variable

Solution

Question 7

Ordinal data

Nominal data

Interval data

Ratio data

Solution

Question 8

Linear

Non-linear

No correlation

None

Solution

Question 9

1> r > 1

-1< r < 1

1< r > 1

1< r < 1

Solution

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Question Analysis

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r²= .2