A random sample of 81 restaurants from a large metropolitan area yields a sample average for gross receipts for the first week in June of $72,000 and a sample SD of $9,000. Find an 85% confidence interval for the population average. Interpret. Clearly describe the population to which this inference applies. Based on this interval, would you conclude that average gross receipts for independent restaurants in this metropolitan area the first week of June were higher or lower than $80,000?

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