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A government report says that the average amount of money

Question: A government report says that the average amount of money spent per U.S. household per week on food is about $158. A random sample of 50 households in a small city is selected, and their weekly spending on food is recorded. The sample data have a mean of $165 and a standard deviation of $20. Is there convincing evidence that the mean weekly spending on food in this city differs from the national figure of $158?

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