We used Wilcoxon rank sum tests with continuity corrections (two-tailed) to identify any statistically significant differences between the video helpfulness ratings provided by students who reported learning the technique previously and those who did not and between the self-reported confidence levels between students who reported learning the technique previously and those who did not. We used Wilcoxon signed-rank tests with continuity corrections (two-tailed) to identify any statistically significant differences between students' self-reported pre-video and post-video confidence levels. We controlled the overall Type I error rate to be 0.05 using a Bonferroni correction (α* = α/m = 0.05/7 = 0.007).