A person wants to count the number of children that play at a playground. He observes the playground for longer than one hour.
Which sentences explain how randomization is not applied in this situation?
Select each correct answer.
The person observing can select a group to go to the park.
There is no control over who is in the study.
There is no selection process.
The person is only observing children.
The person observing chose the time frame of longer than 1 hour.
