![subject](/tpl/images/cats/biologiya.png)
John's parents would not let him study while listening to CD's in his room. They told
Kim that he could not concentrate with the background noise. He decided to test this
idea with an experiment on his class. Each Friday his English class took a vocabulary
quiz on 25 new words learned that week. John got his teacher's permission to try his
experiment. On the first Friday of his test he played a rock song in the classroom
while the class took the test and the following week the class took the test with the
normal quiet atmosphere of a classroom. John calculated the average score on the two
vocabulary
![ansver](/tpl/images/cats/User.png)
Answers: 2
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John's parents would not let him study while listening to CD's in his room. They told
Kim that he c...
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