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According to a research, 58% of households nationwide used natural gas for heating during a year. Recently, a survey of 3,900 randomly selected households showed

According to a research, 58% of households nationwide used natural gas for heating during a year. Recently, a survey of 3,900 randomly selected households showed that 59% used natural gas. Use a 0.05 significance level to test the claim that the 58% national rate has changed.

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