An executive of a startup company thinks that a special vitamin will increase the productivity of workers. 100 workers are randomly chosen and divided into two groups of 50 workers each. Each group is assigned the same task, which is to staple stacks of papers. Group A is given the special vitamin before they begin working. Group B is not given the special vitamin. After an hour the executive counts how many stacks of papers each group has made. Group A made 1,587 stacks and Group B made 2,113 stacks of papers. Identify each of the parts of the scientific method in the experiment by filling in the example