Standard error of mean is computed by
A. $$\frac{{{\text{Sample}}}}{{\sqrt {N - 1} }}$$
B. $$\frac{{{\text{SD of sample}}}}{{\sqrt {{\text{Sample size}}} }}$$
C. $$\frac{N}{{\sqrt {\sigma - 1} }}$$
D. $$\frac{{N - 1}}{{\sqrt \sigma }}$$
Answer: Option B
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