In which of the following scenarios would you be least likely to use a microphone and therefore need to pay extra attention to the volume of your voice?

While Fred is telling a story to his co-worker Sally at lunch time, he notices that as she listens, she makes facial expressions that indicate how she feels about the story he is sharing. This is an example of

a. internal noise. b. external noise. c. feedback. d. a transaction.

In the United States, the ethnic group with the highest proportion of college graduates is 

A. Asians and Pacific Islanders. B. African Americans. C. Non-Hispanic Whites. D. Hispanics.