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Table 5 Comparison between two different formats of videos. Mean total viewing time for each video is reported as the percentage of total video length, for meaningful comparison between videos of different lengths

From: Researching for better instructional methods using AB experiments in MOOCs: results and challenges

Videos Time (s) wpm N (attempted problem) N (watched video) Mean total viewing time % of students with long views % of students with correct final answer
AT1 1004 125 318 36 75 % 25 % 74 %
ID1 1187 118 308 39 96 % 26 % 66 %
      p = 0.02 (U test) p = 0.94 (chi sq.) p = 0.61 (chi sq.)
AT2 659 N/A 294 113 88 % 41 % 93 %
ID2 583 N/A 290 105 108 % 44 % 83 %
      p = 0.05 (U test) p = 0.64 (chi sq.) p = 0.04 (chi sq.)
AT3 731 142 223 67 101 % 45 % 82 %
ID3 943 113 206 75 79 % 27 % 84 %
      p = 0.006 (U test) p = 0.02 (chi sq.) p = 0.8 (chi sq.)
AT4 377 145 212 39 79 % 46 % 84 %
ID4 423 122 195 46 83 % 28 % 98 %
      p = 0.42 (U test) p = 0.09 (chi sq.) p = 0.02 (chi sq.)