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) (citation 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. (citation and 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) (citation omitted).