Important Questions with Answers for CBSE Class 11 Statistics Chapter 7 Correlation which is drafted by expert commerce teachers from the latest version of CBSE (NCERT) books.
CBSE Class 11 Statistics Chapter – 7 Important Questions
Answer: Correlation is a statistical method or a technique that measures, a quantitative relationship between different variables, such as demand and price.
Define partial correlation.
Answer: When more than two variables are involved, and out of these, the relationship between only two variables is suited to treating other variables as constant, then the correlation is partial.
Define the line of best fit.
Answer: The line of the best fit is one of that passes through the scattered points such that it represents most of these points. Roughly, half of the scattered points should be on either side.
Explain the principal methods for calculating the coefficient of correlation.
Answer: The principal methods for calculating the coefficient of correlation are.
- Scattered Diagram Method
- Karl Person’s Coefficient of Correlation, and
- Spearman’s Rank Correlation Coefficient
What is the difference between negative and positive correlation?
Answer: The difference between negative and positive correlation is that in positive correlation, variables move in the same direction, whereas, in the negative correlation, they move in a different direction.
What is the nature of correlation of two variables, when they move in the same direction?
Answer: When two variables move in the same direction, such correlation is positive.
Coefficient of correlation is between -1 and +. How would you express it arithmetically?
Answer: When the coefficient of correlation is -1, correlation is perfect negative, and when the coefficient of correlation is +1, correlation is perfect positive.
When is the rank correlation method used?
Answer: The rank correlation method is used when variables are qualitative, such as bravery, beauty, virtue, and wisdom, etc.
What is a simple correlation?
Answer: A simple correlation implies the study or a relationship between two variables only.
What are the multiple correlations?
Answer: When the relation between three or more variables are studied simultaneously, it is known as multiple correlations.
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