Answer: 4
Explanation:
In performing AVOVA (Analysis of variance)
The number of degrees of freedom corresponding to between treatments = n- 1 , where n = number of treatments
As per given information, we have
The total number of treatments in the experimental design= 5
i.e. n=5
Then, the number of degrees of freedom corresponding to between treatments = 5-1=4
Hence, the correct answer is "4".