Constance Deimer was a surgical nurse at Northwestern Memorial Hospital in Chicago, Illinois. On March 21,1988, Ms. Deimer was injured while moving a Blanketrol Hypo-Hyperthermia machine manufactured by Cincinnati Sub-Zero Products, Inc. (“SubZero”) to an operating room. Just before the injury, the power cord for the machine was lying across the top of the machine. As Ms. Deimer began to push the machine to the operating room, the power cord fell off the machine, and she stumbled on it. Ms. Deimer consequently bumped into the machine and fell. The 185-pound machine (filled with several gallons of water) then became unstable and fell on her knee.
Ms. Deimer brought an action against Sub-Zero on the alternative theories of strict liability and negligent product design. She alleged both that the machine was top-heavy *343 and unstable, and that the machine had an inadequate and detachable cord wrap. The original action was brought in Illinois state court, but Sub-Zero removed the suit to the district court on the ground that the parties were of diverse citizenship. See 28 U.S.C. § 1441.
The district court dismissed the strict liability claim. In regard to the claim concerning the negligent product design of the power cord, the district court granted partial summary judgment for the defendant. The court held that Ms. Deimer’s deposition testimony that she did not look for the cord-storage wrap device on the day of the accident precluded any claim that this alleged defect was the proximate cause of her injury. Trial was conducted on the remainder of the negligence count. However, Ms. Deimer’s expert witness was prohibited from testifying at trial on the cord wrap defect issue. The district court denied Ms. Deimer’s motion, accompanied by a clarifying affidavit, to reconsider the grant of partial judgment, and ultimately the district court granted judgment as a matter of law for Sub-Zero under Fed.R.Civ.P. 50.
On the first appeal to this court, we affirmed the grant of judgment as a matter of law, but remanded the denial of Ms. Deimer’s motion to reconsider the partial summary judgment. We held that “in light of [Ms. Deimer’s] clarifying affidavit,” summary judgment concerning the negligent design of the cord wrap device was not appropriate.
Deimer v. Cincinnati Sub-Zero Prods., Inc.,
After preliminary motions had been addressed, a jury trial was held on April 12, 1994. During the trial, the district court granted Sub-Zero’s oral motion to strike the testimony of Ms. Deimer’s expert witness, Roland Ruhl. The court then granted SubZero’s motion for judgment as a matter of law. In an oral rendition, the district court, relying on
Daubert v. Merrell Dow Pharmaceuticals,
— U.S.-,
DISCUSSION
1.
Recently, this circuit made clear that a federal standard of review governs the adjudication of a motion for a judgment as a matter of law:
[I]t is entirely consistent to say that although state law defines the elements of a claim and the burden of persuasion, federal law defines the standard for evaluating the sufficiency of the evidence. If reasonable persons could not find that the evidence justifies a decision for a party on each essential element, the court should grant judgment as a matter of law — before trial under Rule 56, later under Rule 50, and using the same federal standard each time. By linking the standard for summary judgment to the standard for overturning a verdict, Anderson and Celotex leave no other option. We now adopt the federal reasonable-person standard across the board: pre-trial, mid-trial, post-trial, and on appeal, for evaluating both the merits and the quantum of relief. Contrary decisions are no longer authoritative.
Mayer v. Gary Partners & Co.,
In
Daubert,
the Supreme Court of the United States held that the trial court must, under Rule 702 of the Federal Rules of Evidence, exercise “some degree of regulation of the subjects and theories about which an expert may testify.” — U.S. at-,
[A]n inference or assertion must be derived by the scientific method. Proposed testimony must be supported by appropriate validation — i.e., “good grounds,” based on what is known. In short, the requirement that an expert’s testimony pertain to “scientific knowledge” establishes a standard of evidentiary reliability.
Id.
Our case law has applied
Daubert
by adopting a two-step methodology for the district courts to employ in fulfilling their “ga-tekeeping function” under Fed.R.Evid. 702. First, the district court must determine “whether the expert’s testimony pertains to scientific knowledge. This task requires that the district court consider whether the testimony has been subjected to the scientific method; it must rule out ‘subjective belief or unsupported speculation.’ ”
Porter v. Whitehall Lab.,
In reviewing the district court’s fact-specific application of the approach mandated by
Daubert,
we must apply a deferential standard of review. A “decision to allow expert testimony is within the broad discretion of the trial judge and ‘is to be sustained on appeal unless manifestly erroneous.’ ”
Bradley v. Brown,
2.
We begin with the first of the two inquiries required by the
Daubert
methodology. As we noted in
Porter,
Turning to the proffered testimony in the ease before us, we certainly cannot say that the district court abused its discretion in deciding that the testimony could not be characterized as scientific. At the outset, it is important to note that the record supports the district court’s conclusion that the witness did not conduct any studies or analysis to substantiate his opinion. The district court stated, “There is no supporting methodology or protocol of any kind to render his opinion reasonable or credible. There is not any foundation for him to say how this acci
*345
dent happened, and particularly by virtue of the manufacturer’s power strap and cord and the manner in which it was affixed to the machine.” Tr. Ill at 451. The witness proffered unverified statements that were unsupported by any scientific method. This type of unsubstantiated testimony plainly provides no basis for relaxing the usual first-hand knowledge requirement of the Federal Rules of Evidence on the ground that the expert’s opinion has a reliable basis in knowledge and experience of his discipline.
Daubert,
— U.S. at-,
Even assuming,
arguendo,
that Dr. Ruhl’s testimony was properly grounded in scientific methodology, we still would have to conclude that the district court acted within its discretion in deciding to exclude the testimony. The second step of the
Daubert
inquiry requires that the district court determine whether the testimony would assist the trier of fact in understanding the evidence. The Supreme Court stated that scientific testimony must “fit” the issue to which the expert is testifying to the extent that it is tied to the facts of the case and will aid the jury in resolving a factual dispute.
Daubert,
— U.S. at -,
The excluded submission was the only proffered evidence that Ms. Deimer was injured due to the negligent design of the restraining cord wrap. Once that submission was stricken, there was no evidence of the requisite causation and the district court was constrained to conclude that Ms. Deimer could not prove causation. There was insufficient evidence to permit a rational jury to conclude that the Blanketrol “was an unsafe machine when it left [Sub-Zero’s] possession, control and manufacture, that it was unsafe for its intended use or that [Sub-Zero] should bear liability for what happened here.” Tr. Ill at 458. Accordingly, the district court correctly entered a directed verdict for Cincinnati Sub-Zero.
3.
Ms. Deimer also requests that we review the district court’s award of costs. Initially, Sub-Zero requested $4,551.81 in costs. After thoughtful review, the district court reduced the demand by $1,134.23, and allowed costs totalling $3,417.58. Such a careful evaluation does not evidence an abuse of discretion. Under Fed.R.Civ.P. 54(d), district courts enjoy wide latitude in determining and awarding reasonable costs.
Northbrook Excess & Surplus Ins. Co. v. Procter & Gamble Co.,
Conclusion
Accordingly, the judgments of the district court are affirmed.
AFFIRMED.
Notes
. Fed.R.Evid. 702 provides:
If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
