A researcher calculated sample proportions from two independent random samples. Assuming all conditions for inference are met, which of the following is the best method for the researcher to use to estimate the true difference between the population proportions? Construct a two-sample z -interval for the difference between population proportions.

Construct a two-sample z -interval for the difference between sample proportions.

Perform a z-test for the difference in sample proportions.

Subtract the proportions and construct a one-sample z-interval for a single population proportion.

Subtract the proportions and construct a z-interval for a single sample proportion.