Important Questions for IGNOU MAPC MPC006 Exam with Main Points for Answer - Block 2 Unit 1 Product Moment Coefficient of Correlation

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Block 2 Unit 1 Product Moment Coefficient of Correlation


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1) What is correlation coefficient?

A number expressing the relationship between two variables.


2) What is the range of correlation coefficient?

The range of correlation coefficient is from –1.00 to + 1.00.


3) Is correlation coefficient a percentage?

No. Correlation is not a percentage. But it can be converted into percentage of variance shared.


4) How to calculate common variance from correlation coefficient?

Common variance is calculated from correlation coefficient by using a formula: rxy^2 × 100.


5) What is the percentage of variance shared by X and Y if the r xy = 0.77?

59.29%


6) What is the percentage of variance shared by X and Y if the r xy = – 0.56?

31.36%


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