Steel works slag data

Use the Left and Right buttons to show that sometimes there seem to be two clusters but at other times the gap in the middle disappears.

The dependence of histogram shape on the choice of classes means that it is better to use a stacked dot plot for small data sets.

The 20 values are the percentage FeO in slag from batches of iron ore processed by a steel works.

Without further supporting evidence, the clusters are not pronounced enough for us to conclude that the batches of iron ore must form into two meaningful groups. However they do give an indication of clustering that a good 'data detective' would investigate further.

(Further investigation showed that the clusters did correspond largely to iron ore from two different sources.)