There is no correlation when:
All the points lie on a straight line rising from left to right
All the points lie on a narrow band rising from left to right
All the points are scattered all over the graph.
When all the points are following a narrow band from left to right.
The following scatter diagram shows that:
Correlation is perfect negative
Correlation is perfect positive
Correlation is low positive
Correlation is low negative
The symbolic word for correlation coefficient is:
r
Y
Z
When both variables change in the same direction, then correlation is:
Positive
Negative
Multiple
Constant
Linear correlation means that the correlation between two variables is:
Perfectly positive
Perfectly Negative
Positive or Negative relation and the degree of relationship between two variables is equal at different levels.
Correlation is zero
The other name of rank correlation is:
Karl Pearson's correlation coefficient
Scatter diagram
Liner relation
Spearman's correlation coefficient
The range of simple correlation coefficient is:
0 to infinity
Minus one to plus one
Minus infinity to infinity
0 to one
For the calculation of coefficient of correlation, following formula:
Spearman
Karl Pearson
Max D. Lorenz
Adam smith
When there is positive relation between two variables, than necessary:
Both variables decrease
Both variable increase
Both the variables increase or decrease
One variable decreases and other variable increases
Which is the example of negative correlation?
Age of husband and age of wife
Increase in cost of advertisement and increase in sales
Demand of a commodity may go down as a result of rise in prices
Price of commodity and amount of supply
