What is the test for identifying a juror who has been identified as biased?

When jurors testify that one of the jurors is biased, and the identified juror denies any bias, "the trial court must weigh the credibility of those whose testimony it receives, taking into account the nuances attendant upon live testimony. The trial court may also draw upon the observations it has made of the jurors during voir dire and the trial itself. Naturally, in such circumstances, we afford deference to the trial court's factual determinations, based, as they are, on firsthand observations

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unavailable to us on appeal." (People v. Barnwell (2007) 41 Cal.4th 1038, 1053.)