Add brief slides on other tests

[avahoffman]

• wilcox.test() -- Wilcoxon signed rank test, Wilcoxon rank sum test
• shapiro.test() -- Test normality assumptions
• ks.test() -- Kolmogorov-Smirnov test
• var.test()-- Fisher’s F-Test
• chisq.test() -- Chi-squared test
• aov() -- Analysis of Variance (ANOVA)

could be nice to create some "extra slides" on these for people to refer to when doing the codeathon

[carriewright11]

can also link to case studies - I think we have case studies covering each of these if I remember correctly