Which of the Following Is a Required Condition for Using $n _ { 1 } p _ { 1 } > 30$

Multiple Choice

Which of the following is a required condition for using the normal approximation to the binomial in constructing interval estimate for the difference between two population proportions?

A) $n _ { 1 } p _ { 1 } > 30$ and $n _ { 2 } p _ { 2 } > 30$ .
B) $n _ { 1 } p _ { 1 } > 5$ and $n _ { 2 } p _ { 2 } > 5$ .
C) and .
D) $n _ { 1 } p _ { 1 } > 5,$ $n _ { 1 } q _ { 1 } > 5,$ $n _ { 2 } p _ { 2 } > 5,$ and $n _ { 2 } q _ { 2 } > 5$ .