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An environmental research firm wants to estimate the proportion of cars in Jackson County Missouri that are SUV's. Using the county's vehicle registration records they

An environmental research firm wants to estimate the proportion of cars in Jackson County Missouri that are SUV's. Using the county's vehicle registration records they randomly select 220 vehicles. Based on this sample, the 95% confidence interval for the proportion of cars in Jackson County that are SUV's is: (0.344, 0.474). Which of the following conditions must hold in order for this interval to be valid?

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