correlation

Question 1

what is correlation?

Answer 1

correlation measures the intensity and change between 2 variables

Question 2

what is scatter diagram?

Answer 2

scatter diagram is a visual representation of the nature of association between the 2 variables.

Question 3

mention the types of correlation

Answer 3

positive correlation
negative correlation

Question 4

what is negative and positive correlation

Answer 4

negative - when the variable moves in the opposite direction on the diagram (downwards) it is said to be negative
positive - when the variable moves in the upward direction

Question 5

give an example where correlation will not exist

Answer 5

if r - 0 it means the variables are uncorrelated and there is no relationship between them, eg- food and marks scored

Question 6

mention the different techniques to calc correlation

Answer 6

> scatter diagram
spearman’s rank correlation
karl pearsons coefficient of correlation