When the Necessary Conditions Are Met, a Two-Tail Test Is $\hat { p } _ { 1 }$

Multiple Choice

When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions. The two sample proportions are $\hat { p } _ { 1 }$ = 0.21 and $\hat { p } _ { 2 }$ = 0.15, and the standard error of the sampling distribution of are $\hat { p } _ { 1 }$ - $\hat { p } _ { 2 }$ is 0.018. The calculated value of the test statistic will be:

A) t = -3.33.
B) z = 3.33.
C) t = 3.33.
D) None of these choices are correct.