Read the article "Shining light on those pimples: No aging effect. New treatment zaps acne, not healthy skin" by Jane E. Allen Los Angeles Times, November 16, 2002. (lt's linked on the homework web page.) Specifically in this study (do not give general definitions), what are the
a. experimental units (abbreviated EU, also called individuals or subjects)?
b. treatments
c. How does this study use a matched pairs design?