The factory conducted a survey of the educational background of skilled workers and found that the educational level of technical workers who have newly entered the factory has increased significantly in the past five years. Therefore, the overall quality of technical workers in the factory has been greatly improved. If the above is true, Which of the following _______ cannot support the conclusion. ['Newly-skilled workers in the factory over the past five years are still working at the factory.', 'Less qualified products are produced by highly qualified skilled workers.', 'The higher the qualifications, the higher the quality.', 'Highly educated people will drive other colleagues to improve their quality.']