Experiment Design Analysis - Chicken Farm

Omar is doing an experiment with animal feed and vitamins. He feeds 20 chickens their regular chicken chow. Omar feeds 20 other chickens the chicken chow but with added vitamins. The chickens live in identical chicken houses. After a month Omar weighs the chickens to see which ones have gained the most weight.

  1. Question/Problem:
     
     
     
  2. Hypothesis with a prediction:
     
     
     
  3. Manipulated variable:
     
     
  4. Levels of treatments:
     
     
  5. Responding variable:
     
     
  6. Controlled variable:
     
     
  7. Is this quantitative or qualitative data ?
     
  8. How would you improve this experiment?