Your research partner believes it would be better to measure milk protein consumption as a low/moderate/high question and to quantify the serum antibody level by using the actual amount present. If you take this approach, what analysis method do you propose?

You are asked to conduct a study to determine whether there is an association between consumption of milk proteins and levels of serum antibodies in children with autism. You randomly select 50 children previously enrolled in an autism clinical trial, and they are the sample for the study. You select an alpha of 0.05 and a power of 0.80.