Which Formula Would Be Used to Determine the Sample Size $$n = \frac { \sigma ^ { 2 } z ^ { 2 } } { D ^ { 2 } }$$

Multiple Choice

Which formula would be used to determine the sample size using the formula for the standard error of the proportion?

A) $$n = \frac { \sigma ^ { 2 } z ^ { 2 } } { D ^ { 2 } }$$
B) $$n = \frac { \pi ( 1 - \pi ) z ^ { 2 } } { D ^ { 2 } }$$
C) $$\sigma _ { X } = D / z$$
D) A and C are correct