# Miller (1957): The Magical Number 7 Plus or Minus 2

Miller (1957) reviewed a large number of research studies in order to draw some conclusions about the capacity of STM.

The graph below shows a set of experimental results of the type reviewed by Miller. As in the experiment you tried, participants (PPs) were given digit lists of increasing length to recall. On the right are a number of statements that describe the results, but only three of them are correct. Study the graph, then drag the three correct statements into the boxes.

The majority of PPs can recall up to 9 digits correctly
The majority of PPs can recall up to 7 digits correctly
There is a positive correlation between list length and correct recall
Almost all PPs can recall up to 4 digits correctly
The majority of PPs make errors once the number of digits exceeds 6
PPs' performance declines sharply between 2 and 5 digits
Fewer than 10% of PPs are able to recall more than 9 digits correctly