An increase in average intelligence test performance during the past decade would best illustrate why intelligence testing requires up-to-date validity tests. standardization. reliability indices. processing speed estimates.

standardization

Explanation:

Standardization is the most important term for intelligence tests .it is important that the intelligence test should be standardized regularly or up to date. It is because of all overpopulation the level of intelligence changes consistently. Even sone time increased the level of intelligence test may vary from country to country. The main point increase in 10 years is 3. The observation that scores intelligence test worldwide increased substantially over the decades which is called Flynn effects. better nutrition, increased information portal, and more familiarity with multiple choices. Tests are responsible for Flynn's effects. We have another standardization that people picture in that we can have their chronically age and mental we can calculate by Binet test