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Which of the following is the correct "random" condition that must be met to calculate a...

Which of the following is the correct "random" condition that must be met to calculate a confidence interval for the difference between two proportions?

An SRS must be used to collect one of the samples.

An SRS must be used to collect both of the samples.

An SRS is not necessary since there are two populations.

An SRS is not necessary as long as n > 30.

Math   Statistics-And-Probability   
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