Correlation - Online Test

Q1. Following are the elements of correlation except
Answer : Option B
Explaination / Solution:

It is not necessary that there must be a curvilinear relation among variables,it can be linear or non linear correlation.

Q2. Two variables are said to be positively correlated when with _____ in the value of one variable, the value of other variable also _____
Answer : Option B
Explaination / Solution:

Positive correlation implies that both the variables will move in the same direction, either both will rise or both will fall.

Q3. If with the fall in the value of one variable the value of another variable rises in the same proportion then it is said to be
Answer : Option C
Explaination / Solution:

Because both the variables are moving in different directions.

Q4. If the coefficient correlation exactly equals to -1 then it will be effect
Answer : Option C
Explaination / Solution:

Because a negative value of correlation indicates an inverse relation.

Q5. When the correlation is only studied between two variables it is called
Answer : Option A
Explaination / Solution:

Because it is very easy and simple to calculate correlation between two variables.

Q6. Multiple correlation is
Answer : Option B
Explaination / Solution:

Because here we have to go to calculate correlation twice or thrice, with different variables.

Q7. If the ratio of change between the two variables is a constant then there will be
Answer : Option A
Explaination / Solution:

Because due to this constant change, the data form a straight line on graph paper.

Q8. Correlation coefficient is denoted by
Answer : Option B
Explaination / Solution:

"r" denotes Karl Pearson's coefficient of correlation.

Q9. Who was a great biometrician and statistician?
Answer : Option C
Explaination / Solution:

Karl Pearson was an influential biometrition and statistician who has been credited with establishing the discipline of mathematical statistics.

Q10. When r = 1, there is perfect
Answer : Option C
Explaination / Solution:

As 1 shows perfect relation between two variables and the + sign shows positive relation