Under , colleges and universities are required to provide qualified sign language interpreters and other auxiliary aids needed to ensure effective communication opportunities for the deaf and hard of hearing student population.

Section 504 of the Rehabilitation Act of 1973 and the Americans with Disabilities Act (ADA).

Explanation:

The act provide that school should make provision for qualified sign language interpreters and other auxiliary aids needed to ensure that American living with disabilities such as deaf and hard of hearing students are effectively communicated to in order to bridge the gap between them and other students. The ADA regulations specifically address the obligation of a school board or other public entity to remove communication barriers for deaf individuals so that they will not miss out in information sharing.

National Association of the Deaf (NAD)

Explanation: National Association of the Deaf (NAD) is an organization which aims are to protect and assist with the civil rights, human rights, and linguistic rights of deaf and hearing impaired people. It has an association in all 59 states of the United States, and Washington DC. It's is a member of the world federation of the Deaf.

The given situation is an example of cohort differences.

Explanation:

A cohort study is a form of study that samples a group of people that performs a cross section at particular intervals through time. Such a group is called cohort and it shares a defining characteristic, generally the one which experiences a common event in a particular period like graduation or birth.

Example: studying the mathematical ability of two groups of adults born 50 years ago and 25 years ago and analyzing the cohort differences in the scores of the test.

Therefore, the given situation is an example of cohort differences