In an experimental investigation the group that is not manipulated by the researcher and is then compared to the experimental group is called the blank group? fill in the blank.

In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the control.

There are 2 main type of groups in experimental investigations:

In summary, the group that is not manipulated by researcher during experimental investigations and then compared to the experimental group is known as the control group.

More on research groups can be found here:  

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.