The IID Normal Model:

Bottom buttons: draw 1, 5, 10, or 25 iid normal obserations

(red dot above last draw, total number drawn shown at right)

Top buttons:

showTrue: click to show or hide the normal density you are drawing from
showCI, PI: click to show 95% confidence interval for the mean (red) and 95% predictive interval (green)
showHist: histogram
toggleTrue: randomly pick a new normal curve

If you hide the density and then click "toggleTrue" it is a bit like real life in that
you are trying to guess the mean from the draws.