An experimental group is the group in an experiment that receives the variable being tested. One variable is tested at a time. The experimental group is compared to a control group, which does not receive the test variable. In this way, experimental groups are used to find answers in an experiment.
1 At around 9 months of age, babies begin to pull themselves up to a standing position. 2  By 10 months of age, a baby should be able to grasp objects with thumb and forefinger.
If you don't take the easy way out and work with them every time, almost all children 2 and up can grasp this in a matter of weeks and in some cases a few days. also they should learn how to at the age of around 4 years old.ccording to the American Academy of Pediatrics, children typically name at least 4 colors at age four. This can vary from child to child and their is a large variation of n â¦ ormal. As a parent, I would say between 2-3 years is average with mastery of most basic colors by age 4.