Probable error extracted
A. $$0.6745\frac{{\left( {1 - {r^2}} \right)}}{{\sqrt N }}$$
B. $$\frac{{\left( {1 - {r^2}} \right)}}{{\sqrt N }}$$
C. $$\frac{{\left( {1 - {r^2}} \right)}}{N}$$
D. $$\frac{{\sqrt {\left( {1 - {r^2}} \right)} }}{{\sqrt N }}$$
Answer: Option A

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