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To find the parameter is being estimated by the sample proportion ${\hat{p}}_1$.

The null hypothesis $H_0:p_1=p_2$ is used in the hypothesis test for two population proportions.
The hypothesis test is applied to two population proportions in this case.
The population proportions $p_1$can be used to determine the sample proportion ${\hat{p}}_1$.
As a result, the population proportions $p_1$are used to estimate the sample proportion ${\hat{p}}_1$.

To find the parameter is being estimated by the sample proportion ${\hat{p}}_2$.

The null hypothesis $H_0:p_1=p_2$ is used in the hypothesis test for two population proportions.
The hypothesis test is applied to two population proportions in this case.
The population proportions $p_2$can be used to determine the sample proportion ${\hat{p}}_2$.
As a result, the population proportions $p_2$are used to estimate the sample proportion ${\hat{p}}_2$.

To find the parameter is being estimated by the pooled sample proportion ${\hat{p}}_{\mathrm{p}}$.

The null hypothesis $H_0:p_1=p_2$ is used in the hypothesis test for two population proportions.
The hypothesis test is applied to two population proportions in this case.
$p$is the common value of the proportions $p_1$and $p_2$.
As a result, the population proportions $p$can be used to determine the sample proportion ${\hat{p}}_{\mathrm{p}}$.