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Revenue of Large Businesses A researcher estimates that the average revenue of the largest businesses in the United States is greater than $24 billion. A sample of 50 companies is selected, and the revenues (in billions of dollars) are shown. At α = 0.05, is there enough evidence to support the researcher's claim? σ = 28.7.

178 122 91 44 35
61 56 46 20 32
30 28 28 20 27
29 16 16 19 15
41 38 36 15 25
31 30 19 19 19
24 16 15 15 19
25 25 18 14 15
24 23 17 17 22
22 21 20 17 20

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