Page 29 - Contributed Paper Session (CPS) - Volume 8

CPS2162 Rima Kregzdyte
When data type is defined it is possible to look at the task. All main
statistical tasks may be aggregated into three generalized tasks: to describe
group, to compare groups, to find relationship. The tasks can be imagined as
branches (Figure 2). When students decide what generalized task is related to
the formulated problem, they are able to find more detailed task. Detailed
statistical task could be: to describe quantitative variable in two groups, to
compare two independent groups, to compare 2 dependent groups, to
compare more than 2 independent groups, to compare more than 2
dependent groups, to evaluate relationship.

Figure 2. Presentation of statistical tasks.
(Lime tree at Lipka in Czech Republic – finalist of the European Tree of the Year
2011)

For each task the appropriate statistical test must be chosen. Separate tests
can be imagined as leaves of a tree. Basic tests can be presented as in general
as in the simplified trees (Figure 3 and Figure 4). Similar trees eliminate fear of
mathematical formulas. Students become more flexible in discussions about

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