People who get angry easily tend to have more heart disease. That is the conclusion of a study that followed a random sample of 12,986 people from three locations for about four years. All subjects were free of heart disease at the beginning of the study. The subjects took the Spielberger Trait Anger Scale test, which measures how prone a person is to sudden anger. Displayed are data for the 8474 people in the sample who had normal blood pressure. CHD stands for "coronary heart disease," which includes people who had heart attacks and those who needed medical treatment for heart disease. CHD No C HD Low an ger 53 3057 Total 3110 Moderate anger 110 4621 4731 High a nger 27 606 633 Tota 1 190 8284 8474 Macmillan Learning SOLVE: Give the value of the chi-square test statistic. Give your answer to at least two decimal places. x² = SOLVE: Give the number of degrees of freedom. df =

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