Timmy is really nervous about his presentation to the board of directors. He tends to stand straight up, move from one foot to the other and hold on to the podium. A better strategy might be to A. sit behind the podium and read the slides.
B. turn the lights down and show the PowerPoints on a big screen.
C. tell a joke at the beginning of each paragraph.
D. walk around or stand in particular spots for different lengths of time.
E. add a low-level light show behind you to distract the audience.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: