Question: In a study to determine the difference in preference rates for a particular tee shirt logo between two regional cities, random samples of potential customers

In a study to determine the difference in preference rates for a particular tee shirt logo between two regional cities, random samples of potential customers were surveyed. In City A, 60 out of 100 preferred the particular logo, while in City B, 80 out of 200 preferred the logo.

The 95% confidence interval estimate for the difference in proportions for the two cities is closest to:

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