What is the test for establishing that a factual inference to be drawn is not per se a question of law?

Where, as here, the parties stipulate to facts which form the basis for a further inference of fact, "the factual inference to be drawn is not per se a question of law and the law controls only the reasonableness of the inference." McKinney v. Kull, 118 Cal.App.3d 951, 956, 173 Cal. Rptr. 696 (1981) (citation omitted). "Where the inferences are conflicting, it is for the trier of fact to resolve the conflict

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in the absence of a rule of law specifying the inference to be drawn." Id.