Question

If you wanted to conduct an experiment to determine the temperature at which milk freezes compared to other liquids, such as water or juice, explain the steps you would need to make it a fair test

Answer 1

The thermal conductivity differences between milk and water might be a small factor; however, given the large differences, I'm guessing the following are more important:
1) Starting temperature differences
2) Differences in the weight of the samples
3) Differences in container shapes, volumes, surface areas
4) The freezing point for your water samples (unless it was distilled water)
5) The heat of fusion difference between the milk and water