Do people who write by hand have a better memory of what they write than those who write using a keyboard? To test this, researchers had 36 participants in a study write down a long list of words read out loud to them. They were then asked to put aside their list and try to recall as many of the words as possible. Two methods of writing down words were used. One was using a blue-ink regular ball point pen and a notepad. The other was using a laptop equipped with a full-size keyboard. The number of words correctly recalled was the response.

a) Outline a completely randomized design to learn the effect of method of writing words on number of words correctly recalled.

b) Describe in detail the design of a matched pairs experiment, using the same 36 subjects, in which each subject serves his or her own control.