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new system of playing affects performance of players in the field, but can
hardly exclude the impact of the current mental and physical condition of
players. Sometimes, it is impossible to exclude the impact of factors of which
we even have no knowledge (so-called intervening variables). The classic
experiment assumes two groups (experimental and control group). They should
be balanced in a way to allow for objective comparisons. Therefore, the status
of the phenomena under study must be established first and only then the
observed variable can be changed in one (experimental) group (e.g. we check
up on a new procedure in instruction). The traditional approach is applied in the
other (control) group and finally, we compare the results (e.g. of an output
test) with the initial level. For completeness’ sake, we can differentiate between
two types of experiments: laboratory experiment and natural experiment (in the
field, performed in natural conditions).
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