It is called a discrete variable because it represent an integer (whole number, counting number), which comes from a subset of all numbers. Except statistically, people have to be added to groups in "whole" people.
a variable
it is when a bunch of variable are put together in a group.
can a independent variable be changed in a group
a variable group is the group that a scientific supposes in a fact, but it needs to be tested/proven
That is the Control group.
The experimental group contains the variable being studied. This group receives the treatment or manipulation of the variable to observe its effects.
The group that is exposed to the variable being tested in an experiment is called the experimental group. This group is compared to the control group, which is not exposed to the variable, in order to determine the effect of the variable on the outcome being measured.
I believe the what your referring to is the independent variable (changed). This is chosen and it is the relationship between the change in the independent variable which will cause a change in the dependent variable.
The Control Group is not exposed to the tested variable.
In a controlled experiment, the group where the independent variable does not change is called the control group. This group serves as a baseline for comparison with the group where the independent variable is manipulated, helping researchers determine the effect of the independent variable.
The experimental group is the group in an experiment that receives the manipulation of the independent variable. This group is compared to the control group, which does not receive the manipulation, to determine the effect of the independent variable on the dependent variable.
Experiments typically involve:1) Experimental group: the group of subjects exposed to the variable being tested.2) Control group: should be as identical as possible to the experimental group, but is deliberately not exposed to the experimental variable - this provides a baseline measure from which the effect of the variable can be determined.