Final answer:
Dr. Ables is establishing the test's reliability by administering two versions of the same test. Reliability assesses the consistency of the scores, different from validity which measures accuracy, and standardization which ensures uniform test administration.
Step-by-step explanation:
When Dr. Ables administers two different versions of the same test to a group of people and compares the scores from each version, he is establishing the test's reliability. Reliability refers to the measure's ability to produce consistent, reproducible results across multiple administrations. Specifically, Dr. Ables is likely investigating test-retest reliability or equivalent-forms reliability, which pertain to the consistency of test scores across different versions of the test.
While reliability is focused on the consistency of test scores, validity refers to whether the test accurately measures what it is intended to measure. Standardization involves ensuring that the administration, scoring, and interpretation of the test are consistent across different administrations and for different individuals. This is distinct from the concept of norm-referenced testing, which compares a test taker's scores to those of a representative sample.