Final answer:
Short-term memory has a limited capacity, typically around 7 plus or minus 2 items. Recall is better for random numbers compared to random letters, and auditory information is easier to remember than visual information.
Step-by-step explanation:
Short-term memory has a limited capacity. In 1956, George Miller conducted a review of research and found that the average capacity of short-term memory is around 7 plus or minus 2 items. However, more recent research suggests that working memory capacity is 4 plus or minus 1.
Recall is generally better for random numbers compared to random letters, and auditory information is often easier to remember than visual information.