Question

a group of researchers wants to study the effect of listening to music at different volumes on driving reaction times. they recruit 100 volunteers. they assign each subject a number from 1 to 100 and use a random number generator to assign the first 50 subjects selected to take the driving test with one music volume. the remaining 50 subjects are assigned to take the test with the second music volume. what type of experiment design is this? choose 1 answer: a) completely randomized, b) systematic, c) randomized block, d) matched pairs

Explanation:

In a completely randomized experiment design, subjects are randomly assigned to different treatment groups. Here, 100 volunteers are assigned numbers, and a random number generator is used to assign 50 to one music volume (treatment) and 50 to another, which fits the completely randomized design. A systematic design uses a fixed interval, a randomized block design groups similar subjects first, and matched pairs pairs subjects. So the correct type is completely randomized.

Answer:

A. Completely randomized