Rule 301 - Presumption and inference defined.(a) Presumptions. A presumption is an assumption of fact that in a civil case the law requires and in a criminal case permits the trier of fact to make from another fact or group of facts found or otherwise established in the action. A presumption is not evidence. (b) Inference. An inference is a deduction of fact that may logically and reasonably be drawn from another fact or group of facts found or otherwise established in the action. (c) Prima Facie Evidence. A statute providing that a fact or group of facts is prima facie evidence or proof of another fact establishes a rebuttable presumption unless the statute expressly provides that such prima facie evidence is conclusive.