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The phrase "a control group" is correct and usable in written English.
It is typically used in scientific research to refer to a group that does not receive the experimental treatment and is used as a benchmark to measure how the other tested subjects do.
Example: "In our study, we established a control group to compare the effects of the new medication against those who received a placebo."
Alternatives: "a reference group" or "a comparison group".
Exact(60)
Compare the results against a control group.
A control group received nothing.
(A control group received sham injections).
Two-thirds made up a control group.
A control group was also recruited.
Group 1 was a control group.
A control group will receive no interventions.
A control group interpreted scans without photos.
A control group showed no such improvements.
A control group saw no such gains.
A control group received a mock vaccination.
More suggestions(25)
a control group anyway
a control group though
a distinct control group
a control group of companies who
a control group furthermore
became a control group
incorporate a control group
a governance group
a supervision group
a policy group
a monitoring group
a master group
a prevention group
a scrutiny group
a health group
a screening group
a control cluster
a control panel
a tobacco group
a monitor group
a drivers group
a group group
a control console
a control freak
a control mechanism
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com