1) Irregular 2) Like lottery results 3) Randomised 1) Irregular 2) Randomised 
The use of chance alone to assign the participants in an experiment or trial to different groups in order to fairly compare the outcomes with different treatments. Randomization is an important feature of experimental design.
Randomized: The use of chance alone to assign the participants in an experiment or trial to different groups in order to fairly compare the outcomes with different treatments. Randomization is an important feature of experimental design.
The use of chance alone to assign the participants in an experiment or trial to different groups in order to fairly compare the outcomes with different treatments. Randomization is an important feature of experimental design.
Having been assigned to a treatment via a random process. Normally considered to have occurred when the randomization schedule is sent to the unit pharmacist, so they can then dispense the appropriate drug.
[adj] - set up or distributed in a deliberately random way
randomised adjective set up or distributed in a deliberately random way