Testing the difference in two population proportions is useful whenever the researcher is interested in comparing the proportion of one population that has certain characteristic with the proportion of the second population that has the same characteristic.

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Testing the difference in two population proportions is indeed useful for comparing the proportion of one population that has a certain characteristic with the proportion of a second population that has the same characteristic, allowing researchers to determine if there is a statistically significant difference between the two proportions.

Testing the Difference in Two Population Proportions Is Useful Whenever