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