The prices for 30-count packages of randomly selected store-brand vitamin/mineral supplements are listed from three different sources.

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The prices for 30-count packages of randomly selected store-brand vitamin/mineral supplements are listed from three different sources. At the 0.01 level of significance, can a difference in prices be concluded?

Grocery store Discount store Drugstore 6.79 7.49 6.89 7.69 6.09 5.49 7.99 6.10 8.19 6.19 5.15 6.14 7.69 7.29 4.95

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