Tourette€™s syndrome is an inheritable, child hood onset neurological disorder involving multiple motor tics and at least one vocal tic. A U.S. study that was published in the June 5, 2009, CDC Morbidity and Mortality Weekly Report indicated that the syndrome occurs in 3 out of every 1000 school-age children. Further analysis broke the data into household income categories with respect to the federal poverty level€”see the chart below. At the 0.05 level of significance, does this sample indicate that having Tourette€™s is independent of household income?

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Below 200% 200%-400% Above 400% Have Tourette's No Tourette's 65 80 80 17,581 21,795 24,432