Question

question 11 2 pts a controlled experiment is one in which ... the experiment is repeated many times to ensure that the results were accurte. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. there are at least two groups, one of which does not receive the experimental treatment. there are at least two groups, one differing from the other by two or more variables. there is one group for which the scientists controls all variables.

Explanation:

A controlled experiment has an experimental group that receives the treatment and a control group that does not. This allows for comparison to determine the effect of the treatment. Repeating an experiment is replication, a slow - paced experiment is not the defining feature, and groups should differ by one variable (the independent variable) for proper control.

Answer:

there are at least two groups, one of which does not receive the experimental treatment.