According the the U.S. Census bureau, the percentage of Santa Ana residents living in poverty is 17.7% and the percentage of Irvine residents living in poverty is 13.3%. Suppose that the sample sizes were 1200 for the Santa Ana group and 1500 for the Irvine group. Use the survey data to calculate and interpret a 90% confidence interval for the difference in the proportion living poverty between Santa Ana and Irvine.

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