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, factual account of what is seen, heard, etc. An inference is a conclusion drawn from observations. Since new observations can provide more data, inferences (which are based on observations) can change. Observations are based on direct perception (using senses) and are not assumptions. Also, observations don't change based on inferences. And it's observations that involve the senses, not inferences.

Answer:

An inference is likely to change based on additional observations.