They call it Simpson&#x27;s Paradox <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Simpson%27s_paradox" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Simpson%27s_paradox</a>