In the Context of a Two-Proportions Z-Test, Which of the Following

question 8

Multiple Choice

In the context of a two-proportions z-test, which of the following statements about the pooled sample proportion, $\hat { \mathrm { p } }$ , is/are true?
A. It estimates the common value of $p _ { 1 }$ and $p _ { 2 }$ under the assumption that the null hypothesis is true.
B. It is a parameter.
C. It is obtained by averaging the two sample proportions $\hat { p } _ { 1 }$ and $\hat { p } _ { 2 }$ .
D. It is equal to the proportion of successes in both samples combined.

• A)B and D
• B) \(\mathrm { A }\) and D
• C) \(B\) and \(C\)
• D) \(\mathrm { A }\) and \(\mathrm { C }\)

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