Tests which provide information about the relative performance of members of a specific group of students are called :

The correct answer is Norm referenced tests.

Explanation:

1. Definition of Norm-Referenced Tests (NRT):
Norm-referenced tests are designed to compare an individual student's performance against the performance of a broader group of peers, known as the "norm group" or reference group. These tests indicate how well a student performed relative to others (for example, using percentile ranks or grade equivalents).

2. Breakdown of Options:

• Norm referenced tests: These tests specifically evaluate and report relative performance among members of a defined group of students.
• Criterion referenced tests: These tests measure a student's performance against a predefined standard or specific learning objective (criterion), regardless of how other students score.
• Achievement tests: These are designed to measure knowledge and skills acquired in a specific subject area over a period of instruction.
• Diagnostic tests: These tests are used to identify specific learning strengths, weaknesses, and difficulties a student may have prior to or during instruction.

Conclusion:
Because the question specifically asks for tests that provide information about the relative performance of members of a specific group, Norm referenced tests is the correct choice.