A Clean-Well Store is located on a small town in Mindanao. It sells sanitation wares and known for low cost but quality wares. The manager Brad Constantine use to hire OJT from a well-known Technical School (TS). They stay for three to six months for business operation internship and go on to full-time employment in large stores in major cities in Mindanao. International Business College (IBC) and the St. Luke College (SLC) both produce highly competent business graduates and Brad has discovered that productivity is higher if he hires interns from these schools, instead of from just one.Brad compiled over the past few years the performance of the three groups of students.