Fig 1. An example of the answer sheet used in the experiment and possible answers.
During the experiment more than one class could be marked and each sound could be played as many times as needed.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.