When conducting a large sample test of H0 : p = P0 for a single proportion. The test statistic is z = ((ṕ - p0) / √p0 (1 - p0)/n . where ṕ is the sample proportion. Which of the following best explains the justification for the denominator of this tet statistic?
(A) The standard deviation of ṕ is known when the null hypothesis is true.
(B) The standard deviation of ṕ is known when the alternative hypothesis is true.
(C) The sample size is large and therefore the satndard deviation of p0 is approximated well.
(D) The standard deviation of p0 is known when the null hypothesis is true.
(E) The standard deviation of p0 is known when the alternative hypothesis is true.