Final answer:
Miller's Law is supported by the idea that the average short-term memory capacity is between 5 and 9 items. Individual recall ability may vary with different types of information and encoding methods.
Step-by-step explanation:
The reason supporting Miller's Law, which states that the number of objects an average human can hold in short-term memory is 7 ± 2, is that individuals can typically retain between 5 and 9 items in their working memory. This range is often referred to as the "magic number". This theory of memory capacity was bolstered by Miller's review of research in 1956 but has been updated by more recent studies suggesting that the number may actually be closer to 4 ± 1.
Memory capacity varies slightly depending on the type of information being processed; for example, recall tends to be better for random numbers than for random letters. Additionally, the method of encoding can affect memory capacity, with acoustic encoding, or what we hear, often leading to slightly better recall compared to visual encoding, or what we see. Moreover, the processing of memory involves several stages, from the initial sensory memory to short-term memory and eventually, if rehearsed, into long-term memory storage.