A study of postmenopausal women on hormone replacement therapy (HRT) reported that they had a reduced heart attack rate, but had even greater reductions in death from homicide and accidents -two causes of death that cannot be linked to HRT. It seems that the women on HRT differ from others in many other aspects of their lives -for instance, they exercise more; they also tend to be wealthier and to be better educated. Use the language of statistics to discuss what these data say about the relationships among HRT, heart attack risk, and variables such as exercise, wealth, and education. Use a schematic diagram similar to Figure 7.4.1 to support your explanation.
Figure 7.4.1

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Table 7.4.1 Weight (mg) Mean SD Males Females 0.94 0.30 1.53 0.28