What is the test for substantial evidence in an appeal from a denial of disability benefits?

"When deciding an appeal from a denial of disability benefits, we focus on the administrative ruling rather than the district court's opinion." McIntyre v. Colvin, 758 F.3d 146, 149 (2d Cir. 2014) (internal quotation marks omitted). "We conduct a plenary review of the administrative record to determine if there is substantial evidence, considering the record as a whole, to support the Commissioner's decision and if the correct legal standards have been applied." Id. (internal quotation marks omitted). "Substantial evidence" is "more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion." Richardson v. Perales, 402 U.S. 389, 401 (1971) (internal quotation marks omitted).