Correlation Flashcards
Mention types of correlation
- Positive correlation
- Negative correlation
What is negative correlation? Give example.
The correlation is negative when the variables move in opposite directions. For example the price of apples fall when its demands increase. And when the price rises its demands decrease.
What is positive correlation? Give example.
The correlation is said to be positive when it moves together in the Sam’s direction For example when the income increases, consumption also increases. When the income decreases also decrease consumption decreases
Mention which type of correlation is associated with
(9)production of vegetable
(b) temperatures sales of Ice creams
(A) negative correlation
Cb) positive correlation
Interpret the values on as 1,-1, and 0
When r is 1, then there is perfect positive relationship
When r is -1, the there is a perfect negative relationship
When r is 0then there is no relationship
What is correlation
Correlation analysis is means of examining relationships between two variable systematically
What is scatter diagram?
A scatter diagram is a useful technique for visually examining the form of relationships without calculating any numerical value
Write the formula for spearman’s rank correlation
r=1-6.£d2/n3-n
The range of simple correlation coefficient lies between
-1 and 1
If Rxy is positive the relation between x and y is of the type
When Y increases X also increases
If Rxy=0 then variable X and Y are related
Non linearly
Rank correlation was developed by
CE spearman
The correlation is __________ when variables move together in the same direction
Positive
Scatter diagram presents the nature of association _______________
Between two variables
Correlation is said to be ________ if the scatter points lies on a line
perfect positive
Karl person’s correlation coefficient efficient is called as ___________ correlation
Product moment
Give an example for the variable which cannot be measured numerically
Attributes are those variables which cannot be numerically measured such as intelligence of people, physical appearance, honesty, fair ess, popularity etc
Wha does correlation measure
Direction and intensity of relationship among variables
