3. The variable descriptions for this dataset can be found at the Canvas instructions and here I give a summary: MEDV the median value of owner-occupied homes (in thousands of dollars), RM (average number of rooms), AGE (proportion of owner-occupied units built prior to 1940), CRIM (crime rate), ZN (proportion of residential areas), INDUS( proportion of non-retail business area), CHAS (river limitation), TAX (cost of public services in each community), PTRATIO (pupil-teacher ratio), B (variable that shows proportion of African American population), LSTAT (percent of lower status of the population), DIS (distances to five Boston employment centers), RAD (accessibility to radial highways - larger index denotes better accessibility), NOx (annual concentration of nitrogen oxide). Which of the variables are quantitative, which of the variables are categorical