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A concerned group of citizens wanted to determine whether the proportion of armed robberies in the state of Texas was different in 2011 than in

A concerned group of citizens wanted to determine whether the proportion of armed robberies in the state of Texas was different in 2011 than in 2010. Research shows that of the 113,231 violent crimes in Texas in 2010, 7,622 of them were armed robberies. In 2011, 7,439 of the 104,873 violent crimes were in the armed robery category. Test at the 0.01 significance level. Preliminary: a. Is it safe to assume that 72010

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