8. As part of the SPC Reads initiative, Prof.Rosengarten needs to find out what the 10 most popular books right now are with current students. She breaks students into groups based on home campus and class, then randomly selects 15 from each group. What sampling method did Prof. Rosengartenemploy?

9. What is the standard deviation of the following sample data: 34, 30, 12, 28, 29, 18.

Round to 2 decimal places as needed.

10. In a 2014 study, Grossi, Larach, Canals, Vsquez, and Iriarte-Diaz connected weighted sticks to the back of 4 domestic chickens to mimic the tail of a dinosaur and recorded the chicken both walking and standing. They concluded that the manner in which these chickens with dinosaur-like tails then walked in a manner consistent with to the theorized manner in which non-avian dinosaurs walked. What is the population of this study?

11. What is the standard deviation of the following sample data: 49, 36, 13, 36, 16, 30.

Round to 2 decimal places as needed.

13. In a 2011 study, Wilkinson, Sebanz, Mandi, and Huber observed the reactions of 7 tortoises when exposed to an eighth tortoise that had been trained to yawn on command. Researchers were specifically looking to see if the 7 observed tortoises would yawn in reaction. What is the population of this study?