Discussion
If the value of co-efficient of determination is 0.64, what is the value of coefficient of correlation ?
Answer: B
The coefficient of correlation is 0.80, because the coefficient of determination is the square of the correlation coefficient.
\[ r^{2} = 0.64 \]\[ r = \sqrt{0.64} = 0.80 \]The value 0.40 is half of 0.80 and 0.64 divided by 1.6, which is not a recognised step. The values 0.08 and 0.04 are obtained by moving the decimal point wrongly. Strictly r could be minus 0.80 as well, but only 0.80 is offered.
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