Which of the following are the means of control in experimental research?

The means of control in experimental research are controlling physical settings, choosing participants and statistical analysis.

Controlling physical settings keeps the surroundings uniform so they do not distort the effect.

Careful choice of participants, often by randomisation, balances individual differences across groups.

Statistical analysis controls remaining variation and adjusts for measured confounds.

Focussing on short-term effects is a scope limitation, not a means of control.

Side-tracking the causal factors would defeat control, since the causal factor is what an experiment studies.