The burden of demonstrating that expert testimony is competent, relevant and reliable rests with the proponent of the testimony. Kumho, 526 U.S. at 147-52. d. A trial court has wide discretion in determining the admissibility of expert testimony. In reviewing a trial court’s decision about how to determine reliability and admissibility of expert testimony, a court of appeals is to apply an abuse of discretion standard. Kumho, 526 U.S. at 152; Palmacci v. Umpierrez, 121 F.3d 781, 792 (1st Cir. 1997); Bogosian v. Mercedes-Benz of North America, Inc., 104 F.3d 472, 476 (1st Cir. 1997).