Classification problem

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• Predict a discrete valued output (yes/no) or (A, B, C, D)

• Brest Cancer: Tumor size (x) vs being malignant or benign (y) - two distinct possibilities. Given a tumor (and its size) what is the probability that it is malignant?
• The Tumor size is a "feature". In other problems we might have many more features.
• e.g. We might know both the tumor size and the age of the patient.