Yam growth data

It is difficult to get information from an unsorted numerical list. Sorting makes it easier to understand the distribution of values.

After sorting, ask the students whether they see anything unusual. Click Answer to highlight the gap in the middle of the distribution; discuss the possibility of two distinct clusters.


Click Show dot plot to display the data graphically. Explain that the graphical display shows distribution better than sorted list.

The dot plot and list of values are dynamically linked so clicking crosses highlights the values in the list (and vice versa).

The data set shows the growth (cm) of the main stalks of 20 yam plants over a period of seven days.