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The gas company claims that two thirds of the houses in a certain city are heated by natural gas. Do we have reason to doubt

The gas company claims that two thirds of the houses in a certain city are heated by natural gas. Do we have reason to doubt this claim if, in a random sample of 1000 houses in this city, it is is found that 618 are heated by natural gas? Use a 0.02 level of significance.

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