Which ArcGIS Online analysis tool calculates statistics in areas where an input layer overlaps a boundary layer?

The analysis tool that calculates statistics in areas where an input layer overlaps a boundary layer is the one that focuses specifically on summarizing attributes based on a defined boundary. This tool processes the data by examining input features and aggregating their attributes based on spatial relationships with a boundary layer.

When utilizing this tool, users can analyze how many features fall within a specified boundary and summarize attributes (such as counts, sums, or averages) for those features. This capability is particularly useful for understanding distributions and patterns within predefined areas, such as neighborhoods, districts, or any other defined entities.

For instance, if you have a layer of points representing sales locations and a layer of zip code boundaries, the tool will count and summarize sales statistics within each zip code, giving valuable insights into regional performance.

The other options, while relevant tools, serve different analytical purposes. For instance, one might aggregate points or join features on attributes without focusing on the spatial relationship concerning a boundary, which would not directly yield statistics within those areas as effectively as the chosen tool.