Ms. weatherbie, a music instructor, wanted to know if students who could read music were better in choir than students who could not read music. to find out, she randomly assigned some students to a class in which they were read music in addition to learning the words to the songs. she randomly assigned other students to a class in which they only learned the words to the songs. this study is an example of

Experimental research

Explanation:

Experimental research consists of any kind of research based on scientific methods, keeping some variables constant, and others are under measurement, giving them priority in the experiment (they are the subject). In times when a researcher does not have sufficient information to support his/her choices, he/she will have to perform experiments to figure out the facts. In this way, he/she will collect a big amount of data and make better decisions.

what are the choises i cant answer without choises