<prompt> Which of the following variables is measured on the ordinal scale-Type of anemiaSeverity of anemiaHemoglobinSerum ferritin  <response>: When data is ranked e.g. mild, moderate, severe ordinal scale is used. Therefore the severity of anemia is measured on the ordinal scale.Type of anemia can be divided into qualitative categories Macrocyticmicrocytic, hemolyticnon-hemolytic Nominal scale is used.Serum ferritin and hemoglobin are quantitative variables with a possible absolute zero value Ratio scale is used. 