Which sampling technique divides the population by some factor?

There is an optimal length from which a muscle can generate maximum tension, which defines the ____________________ (hyphenated words) relationship

Fill in the blank(s) with the appropriate word(s).

Because some of the mandatory immunizations require several months to complete, it is wise for the medical assistant to begin the immunization process ________ months before his or her expected externship.

A. two to three B. four to five C. six to seven D. eight to nine