What is the test for inference in a civil case?

A jury is not permitted to draw an inference only "when the supporting evidence is so strong the inference must be found as a matter of law. . . . Even 'slight evidence' in support of the fact to be inferred has been held to be sufficient. It is up to the jury to assess the credibility and judge the weight of the evidence proffered in support of and in opposition to the fact it is asked to infer." (Fashion 21 v. Coalition for Humane Immigrant Rights of Los Angeles, supra, 117 Cal.App.4th at p. 1150, fn. omitted.) If the evidence "could, but not necessarily would, lead a reasonable trier of fact to infer" the ultimate fact being established, it is sufficient for purposes of appeal. (Ibid.)