“…The medium-sample participant size (between 20 and 100 participants) is usually gathered for museum-exhibition-or laboratory-based system evaluation that needs to reach a certain threshold of observations to have significant evidence in their measurements based on statistical power analysis [21]. Besides, the installation and conduct of system evaluation in a great exhibition or a big museum hall facilitate the collection of large number of participants through visitors (more than 100) [14,18,32,37,61,64]. For some user studies, the number of participants was not available [28,47,66].…”