The fact that we communicate with others nonverbally even when we may not intend to do so

When you speak into a microphone, you should raise your voice slightly.

Answer the following statement true (T) or false (F)

You conduct a survey of parking problems on your campus by talking to students who try to park between 7 a.m. and 9 a.m. Your results may not be valid because the survey was not ________.

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