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Answer:
Decay; interference
Explanation:
Peterson and Peterson were careful to eliminate factors other than time that might affect recall. Interference tasks reduced the chances of rehearsal before recall. Their hypothesis also lacks ecological validity - how often is a person needed to remember trigrams in reality?
self-made millionaire; food relief-- WWI; Sec. of Commerce(Harding/Coolidge); believed in as little gov interference in economy as possible; his WWI food efforts, and his role in the great Mississippi River flood of 1927, earned him the nickname "The Great Humanitarian"
Learning without direct reinforcement but by watching others is part of the behavioral approach. It is called modeling.