Answer:
Quantitative techniques.
Explanation:
Gabriel is using quantitative techniques in order to better analyze, strategize, plan, control, and direct his company's operations.
Statistical information and numerical analysis are quantitative techniques because they use mathematical models to reach a particular conclusion or result.
These techniques tend to be very effective because they are likely to be more accurate than qualitative techniques, however, they do not always suffice, and CEOs frequently have to rely on other techniques (such as intuition) to take decisions.
