If a geologist discovered striations (scratches) on bedrock surfaces and small hills composed of poorly sorted sediment, what could he or she conclude about the area?

The conclusion about the area would be that the glaciers had once covered the area. 
All glaciers scrape up sediments and incorporate them into the base of the ice sheet. Sand, gravel, and large boulders polish and gouge the surface of the bedrock that they are dragged over leaving glacial striations. Glaciers do not sort sediments as flowing water and wind do. Poorly sorted glacial sediments are known as till. 

Generally travels west to east but often shifts to north and south