Does a class break stimulate the pulse? Here are heart rates for a sample of 30 students before and after a class break. Research question: At α = .05, do the medians differ?

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Heart Rate before and after Class Break After Student BeforeAfter Student Before 70 69 16 17 18 19 20 21 76 78 70 69 73 70 59 4 82 82 65 81 56 23 24 25 26 27 28 29 30 65 63 57 10 78 75 79 74 93 12 13 71 67 59 63 75