Now we'll move on to an investigation of comparative experimental studies. We'll begin with a problem related to human memory and, in particular, short-term recall. Note 4
Is it easier to remember strings of characters that spell familiar words than to remember arbitrary strings of characters?
Which list do you think would be easier for most people to remember -- words like those in List A, or character strings (non-words) like those in List B?
In order to explore this question, you'll need appropriate data -- and to get this data, you'll need a method of measurement. Note 5