Answer:
Because an observation refers to something real that can be observed; whereas an inference refers to an assumption.
Explanation:
Observation is the act of observing, it means having your attention directed to something real and specific, in order to later judge, analyze or investigate a particular thing or someone. An inference, on the other hand, is an information-based deduction or reasoning that uses available data to reach a conclusion. As we can see, "observation" and "inferences" are words with very different meanings, so we can say that an observation cannot be an inference.
