2 Broken Hearts In a study of 900 randomly selected Americans, data are collected for whether or not the subject has had a heart attack (attack = 1 if had a heart attack, 0 otherwise) along with variables age, systolic blood pressure, diastolic blood pressure, if they smoke or not. A subset of those data are presented in the table. Heart attack age systolic bp diastolic bp smoke 55 1 43 60 50 65 62 47 45 1 0 0 1 143 122 124 162 130 128 114 127 95 75 83 90 92 87 69 86 1 0 a) With these data, the probit and logit models cannot be used! This is because a single variable perfectly predicts heart attacks!! Notice that heart attack always equals 1 when systolic bp > 128 and never equals 1 when systolic bp