In a general class interval, margin of error is equal to
A. $$m = Z_{1 - \frac{\alpha }{2}}^2.\frac{\sigma }{{\sqrt n }}$$
B. $$m = Z_{1 - \frac{\alpha }{2}}^2.\frac{{{\sigma ^2}}}{{\sqrt n }}$$
C. $$m = Z_{1 - \frac{\alpha }{2}}^2.\frac{\sigma }{n}$$
D. $$m = {z_{1 - \frac{\alpha }{2}}}.\frac{\sigma }{{\sqrt n }}$$
Answer: Option A
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