Answer
In this case, we have 50 students where each student performed memory test once listening to the music and once without listerning to music.
It is clear that same set of people is used twice, i.e. once listening to music and second time without listening to music.
So, it is a case of paired t test or dependent t test because samples in both tests are dependent or same.
We will not use pooled t test because we dont know about the standard deviation and it is also not a z test because population standard deviation is unknown.
So, option B is correct answer
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