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UPSC NDA I 2011 Mathematics Paper

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Question : 39

Total: 120

Consider the following statements with regard to correlation coefficient r between random variables x and y :
1. r=+1 or −1 means there is a linear relation between x and y.
2. −1≤r≤1 and r2 is a measure of the linear relationship between the variables.
Which of the statements given above is\/are correct?

1 only
2 only
Both 1 and 2
Neither 1 nor 2

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