What is the test for determining whether a prosecutor's reasons are genuine?

"Although we generally `accord great deference to the trial court's ruling that a particular reason is genuine,' we do so only when the trial court has made a sincere and reasoned attempt to evaluate each stated reason as applied to each challenged juror. [Citations.] When the prosecutor's stated reasons are both inherently plausible and supported by the record, the trial court need not question the prosecutor or make detailed findings. But when the prosecutor's stated reasons are either unsupported by the record, inherently implausible, or both, more is required of the trial court than a global finding that the reasons appear sufficient." (People v. Silva, supra, 25 Cal.4th at pp. 385-386, 106 Cal.Rptr.2d 93, 21 P.3d 769.)