Actually, you are talking about the null hypothesis which is quite different from the research hypothesis. The research hypothesis states that the treatment condition will produce true differences in outcomes. In other words, that the observed effect is not due to chance. In contrast, the null hypothesis states that the independent variable is completely ineffective and that the means associated with the two groups are equal.

Thanks for reading and giving me the chance to clarify that distinction, which is an important one. I just didn’t want to get overly technical as my intention was to discuss why it is some people don’t respond to medications when studies have been published showing their effectiveness.