A controlled scientific investigation is manipulated by a scientist. The intention is to examine a single variable at a time. To do so, it is necessary to have as much control as possible over the experiment and the environment. Listing the procedures, planning the variables, and listing the needed materials are all necessary to design an experiment.
Increase. I don't even know the point of the first sentence. Average Kinetic Energy *is* temperature. The higher AVE the higher the temp. The higher the temp the faster the AVE. They're directly correlated.