The table below displays data showing weight gain,in grams,for 12 young rats,three from each of four litters.Three different diets (the treatments)were assigned at random to the three siblings in litter one (block 1).This was repeated for the other three litters (blocks 2,3,and 4). 
Conduct a Friedman test at the 0.05 level of significance to determine if there are differences between the three diets.
Definitions:
Pulmonary Capillaries
Tiny blood vessels surrounding alveoli in the lungs where Gas exchange of oxygen and carbon dioxide occurs.
Partial Pressure
The pressure a single gas in a mixture contributes to the total pressure, based on its proportion in the mixture.
Ventilation
Process of moving air into and out of the lungs; breathing.
External Respiration
Exchange of oxygen and carbon dioxide between alveoli of the lungs and blood.
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