A nurse is interested in whether there is a relationship between daily

levels of stress and likelihood of a heart attack. The stress scores (predictor variable) and risk of heart attack values (criterion variable) from a small sample of participants are depicted below. (Values below are valid for this question only!)


Stress Score                                Risk of Heart Attack
(Higher values = more stress)     (Higher values = greater risk)
     
     8                                                     6
      0                                                     3
      6                                                     4
      4                                                     1


Set up the regression equation and use to predict the risk of heart attack for a person with a stress score of 7. The risk of heart attack predicted for a person with a stress score of 7 is?