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The economy is declining in these two years and the average income of the workers in food & beverage industry seems to have decreased a

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The economy is declining in these two years and the average income of the workers in food & beverage industry seems to have decreased a lot as well. Assume that the average monthly income was $20,000 three years ago. A researcher wants to test to determine whether this figure has decreased today. The researcher randomly selects 100 samples.

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