Sample size calculation

Let us now return to the different options proposed earlier.

Option 2. Find an extra six goats to be included later. This would achieve the 10, 10, 10 goats originally planned for the three diets.

Comment: This would increase the sample size, especially in the A+D group, but how much of an improvement would this be on Option 1? The researcher had also expressed some doubt as to whether he would be able to find a suitable homogeneous group of goats.