Rounded kernels
With the demonstration data set, show how the kernels 'stack' when they overlap. Click a cross on the dot plot to select its kernel — this helps to show the overlapping of kernels.
With the isometric strength data set, show how the kernel density estimate can be quite smooth — much smoother than a histogram.
In an ergonomic study involving a group of 41 male students from the University of Hong Kong, each student was asked to exert maximum upward force on a horizontal bar which was close to floor level, with his feet 400mm away from the bar. The force was averaged over a 5-second period is called the 'maximum voluntary isometric strength' (MVIS) and is recorded in kilograms.