In order to use a normal distribution to calculate confidence intervals for p, what conditions on np and nq need to be satisfied? select one: a. n and q must be integers b. n must be positive c. np> 10 and nq< 0 d. np and nq must be > 5

In order to use a normal distribution to calculate confidence intervals for proportion, p, by the central limit theorem, the sample has to be sufficiently large.

This condition is determine by ensuring that np and nq > 5.

Therefore, the condition that must be satisfied is np and nq must be > 5. (option d).