What is the test for admitting or excluding expert testimony at a trial?

" ' "[A] trial court has wide discretion to admit or exclude expert testimony. . . . An appellate court may not interfere with the exercise of that discretion unless it is clearly abused." ' [Citation.]" (People v. Manriquez (1999) 72 Cal.App.4th 1486, 1492.) The trial court's exercise of its discretion is governed by Evidence Code section 801, which limits expert testimony to that "[r]elated to a subject that is sufficiently beyond common experience that the opinion of an expert would assist the trier of fact." (Evid. Code, 801, subd. (a).) "Expert opinion is not admissible if it consists of inferences and

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