Question

An experiment was conducted to compare the mean reaction times to two types of traffic signs: No Left Turn and Left Turn Only. Ten drivers were included in the experiment. Each driver was presented with 40 traffic signs- 20 No Left Turn and 20 Left Turn Only- in random order. The mean reaction to each type of sign was recorded for each driver. So, for example, individual #1 reacted, on average, within 824 milliseconds to the No Left Turn and within 702 milliseconds to the Left Turn Only sign. The design of this experiment most closely resembles a:

Answer 1

A. Matched pairs where subjects are matched on a set of characteristics before random assignment
B. Completely randomized design
C. Pseudo-randomized block design
D. Randomized block design, blocking on type of traffic sign
E. Matched pairs before and after design