A student has taken a summer job answering telephone calls for sales orders. He quickly learns that it is pretty easy to remember a customer's five-digit ZIP code and seven-digit phone number,
but it is much more difficult to keep track of a sixteen-digit credit card number. According to the conclusions of researcher George Miller, the student is having trouble with longer strings of numbers because
a. the capacity of iconic memory is quite limited.
b. memory span covers only five to nine items.
c. memory span does not exist.
d. the information is staying in his sensory memory.
Answer: b. memory span covers only five to nine items.
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