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9. A random sample of 16 four-person families visiting Disneyland was selected, and the average amount spent by these families on their Disneyland visit was

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9. A random sample of 16 four-person families visiting Disneyland was selected, and the average amount spent by these families on their Disneyland visit was $725.00. The sample standard deviation is $80.50. Find the 90% confidence interval for the true population mean. Express the interval endpoints to the nearest cent

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