You read a newspaper article that describes a study of whether stress management can help reduce heart attacks. All 107 subjects had reduced blood flow to the heart and so were at risk of a heart attack. They were assigned at random to three groups. The article goes on to say:
One group took a four-month stress management program, another underwent a four-month exercise program, and the third received usual heart care from their personal physicians. In the next three years, only three of the 33 people in the stress management group suffered "cardiac events," defined as a fatal or non-fatal heart attack or a surgical procedure such as a bypass or angioplasty. In the same period, 7 of the 34 people in the exercise group and 12 out of the 40 patients in usual care suffered such events.
The two-way table of heart attack by different types of treatment is given below:

Fill in the blanks: (Give your answers to one decimal place.) The success rate of the stress management program in preventing cardiac events is _ percent. The success rate of the exercise program in preventing cardiac events is percent.

Transcribed Image Text:

Cardiac No Cardiac Total 30 Stress management program3 Exercise program Usual care from physician 12 27 34 28 40 Total 85 107