A cognitive psychologist wanted to investigate whether background sound affects reading comprehension. To test this, she recruited 32 university students. Participants were randomly allocated to one of two conditions.

• Condition A: There were 16 participants in this condition. Each participant was placed individually in a quiet room and given 15 minutes to read a scientific article, after which they completed a comprehension test.
• Condition B: There were 16 participants in this condition. Each participant was placed individually in a room with upbeat lyrical pop music playing in the background. They were given the same 15 minutes to read the same scientific article, after which they completed the identical comprehension test.

Identify the experimental design used in this study and outline one advantage of this experimental design.

Table 1: Total score on the comprehension test across both conditions