A political candidate claims that from 2008 to 2012 the percentage of people aged 25+ in Chicago

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A political candidate claims that from 2008 to 2012 the percentage of people aged 25+ in Chicago without a high school diploma exceeded 25%. Socioeconomic indicators for the city of Chicago during this period are available. 

Use the data “Census_ Data_Selected_socioeconomic_indicators_in_Chicago_2008_2012” to test the researchers claim at 1% significance.

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