What is the test for a jury to convict a defendant beyond a reasonable doubt?

jury, not the appellate court which must be convinced of the defendant's guilt beyond a reasonable doubt. '"If the circumstances reasonably justify the trier of fact's findings, the opinion of the reviewing court that the circumstances might also be reasonably reconciled with a contrary finding does not warrant a reversal of the judgment."' [Citations.] 'Circumstantial evidence may be sufficient to connect a defendant with the crime and to prove his guilt beyond a reasonable doubt.' [Citation.]" (People v. Bean (1988) 46 Cal.3d 919, 932-933 (Bean).)