Alex feels a strange pain in his knee. He takes some Tylenol and puts some ice on it. On a recommendation from his friend Tom, he also eats some raw garlic, which is supposed to be anti-inflammatory. After a few days, the knee feels better and his friend Tom proclaims, “I knew that garlic would do the trick!” But Alex is uncertain. What specific problem with Tom’s interpretation of the personal experience is described here? (Note: there can be more than one thing going on but what does the text specifically focus on?)