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.) |