Hallam, Price, and Katsarou (2002) investigated the influence of background noise on classroom performance for children

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Hallam, Price, and Katsarou (2002) investigated the influence of
background noise on classroom performance for children aged 10-12.
In one part of the study, calming music led to better performance
on an arithmetic task compared to a no-music condition.
Suppose that a researcher selects one class of 18 students who
listen to calming music each day, while a second class of 18
students serves as a control group with no music. Accuracy scores
are measured for each child. Which hypothesis test would be
appropriate for this example?