2. CHOOSE
Fill each gap with the right word. Word bank: a control group, a sample of, data were collected, participants, procedure, randomly selected, reliable, replicate, under controlled conditions, variables.
Word bank: a control group, a sample of, data were collected, participants, procedure, randomly selected, reliable, replicate, under controlled conditions, variables.
a sample of fifty was tested.
data were collected each Monday.
participants answered a survey.
a control group received no change.
We measured two variables.
The procedure took ten minutes.
Names were randomly selected.
Tests ran under controlled conditions.
We replicated the experiment.
The method proved reliable.