Question

which statement best distinguishes an observation from an inference?
an inference is likely to change based on additional observations.
an observation is likely to change based on additional inferences.
an observation involves assumptions, but an inference does not.
an inference involves the senses, but an observation does not.

Explanation:

An observation is a direct and factual account of what is seen, heard, etc. An inference is a conclusion drawn from observations. As more observations are made, inferences (conclusions) can change. Observations are based on direct sensory input (so they involve the senses, contrary to the last option). Inferences do involve assumptions (contrary to the third option). Observations don't change based on inferences (contrary to the second option).

Answer:

An inference is likely to change based on additional observations.