Final answer:
The third stage of test development, known as the national tryout, involves testing a test prototype on a representative national sample to establish standards, ensure consistent scoring, and perform norming to make future interpretations of the test reliable.
Step-by-step explanation:
The national tryout is known as the third stage of test development in creating standardized tests or assessments. This stage involves testing and evaluation of the test prototype with a wider audience to identify potential flaws, biases, or inconsistencies, ensuring the test is reliable and valid across different demographics. Specifically, in national tryouts, the test is administered to a representative national sample, which matches the demographic characteristics of the population for whom the test is intended. This allows developers to collect data, analyze scoring patterns, and ensure that norming procedures are effective. The results contribute to establishing standardization and developing norms, which are then used to interpret future scores on the test. The process is iterative and may require multiple rounds of refinement to address issues discovered during the tryouts.
The national tryout is especially important for tests like the Stanford-Binet Intelligence Scale, where rigorous standards must be maintained to provide accurate measures of intelligence across different groups.