Fig. 7: Results of the credibility rating for the feedback videos.

On average, the credibility of the feedback videos was positive. Ratings by young and older adults differed significantly in the neutral and positive condition. Statistical comparisons were made using a 2 × 3 mixed design permutation F-test (between factor age; within-factor condition) and two-sided two-sample permutation t-tests (with Bonferroni correction). Data are presented in boxplots overlaid with data points. Boxes span from the lower to the upper quantile and whiskers of the boxplots depict data points that are the furthest from the center while still being inside the range of 1.5 times the interquartile range from the lower or upper quartile. Solid lines indicate the median, dashed lines indicate the mean. Asterisks mark significant differences (p < 0.01).