This shiny application allows one to explore the bivariate normal distribution. The user may specify the number of samples from a bivariate normal distribution with standard deviations sx and sy, and with correlation coefficient r. A sample of variables with this distribution is displayed, along with a regression line fit to that data.
Here's a link to this shiny app: http://rafaelespericueta.shinyapps.io/bivariate_normal_explorer
Here's a link to a slide presentation about this app: http://rpubs.com/mathprof/80692