Final answer:
It is false that every decision model contains both objective and subjective factors, as models can vary from entirely objective to entirely subjective, though many incorporate both elements.
Step-by-step explanation:
The statement 'Every decision model contains both objective and subjective factors' is false. Decision models can be entirely objective, entirely subjective, or a mix of both. An objective decision model uses quantitative data and analytical techniques to make decisions, which include factors that can be measured and verified. Subjective decision models involve judgment, intuition, or qualitative assessment where personal opinions or perceptions come into play. However, many decision models in practice contain a combination of both objective and subjective factors.