Two large-eddy simulation / Reynolds-averaged Navier-Stokes (LES/RANS) models are applied to a shock / boundary interaction generated by a 24-degree compression corner. The models are designed to transition from unsteady RANS to LES as the boundary layer shifts from its logarithmic behavior to its wake-like response, but differ in that one model requires a pre-selection of a model constant for each problem, while the other computes this constant as a function of local and ensemble-averaged turbulence properties. Predictions are compared with mean-flow and second-moment experimental data obtained at Princeton University. In general, calculated mean-flow velocity, surface pressure, and surface skin friction distributions agree well with experiment, with the most noticeable discrepancy being an over-prediction of the level of upstream influence induced by the shock wave. Comparisons with mass-flux fluctuation intensity distributions show good agreement with experimental trends relating to fluctuation amplification throughout the interaction. Comparisons with experimental Reynolds axial stress distributions are less favorable. The calculations also predict the existence of a low-frequency motion of the separation shock that is probably associated with the motion of the separation region. A frequency associated with the most probable residence time for fluid entering and leaving the recirculation region is well-correlated with the dominant low-frequency signal obtained from the spectral analysis. This observation may make it possible to predict a dominant low-frequency mode through examination of the mean structure of a shock / boundary layer interaction.