Anthropologist-Psychologist Couple

Today I had lunch with my friend who is doing a Master's program in anthropology. Her boyfriend studies neuroscience/psychology. She said she and her boyfriend often argues because while her boyfriend studies humans based on controlled experiments and statistical inferences, she thinks that "there is nothing more untrustworthy than numbers". It was an interesting perspective, because although numbers give some idea on what's going on, with regards to human's mind and behavior it is almost never the truth. Next time I meet her I would like to discuss this matter more in depth.