1. Work Sample How Big Was the Skull?

2. The Find I found a ground sloth tooth in Wilsonville, Oregon No other fossil material was located in that area It measures 22.70mm x 13.85mm The tooth is the third left tooth of a cranium from a Megatheriium ground sloth http://www.fossil-treasures-of-florida.com/harlans-ground-sloth.htmlhttp://www.fossil-treasures-of-florida.com/harlans-ground-sloth.html for the color photo of the tooth B. J. Shaw: American Museum of Natural History specimen

3. Question Can I determine the size of the skull based on a single tooth? How could I do that? http://apod.nasa.gov/apod/image/0507/impact13sec_deepimpact_hri.jpg

4. Hypothesis Develop a hypothesis about the outcome of your experiment based on your observations, reading, and experience B. J. Shaw, American Museum of Natural History

5. Experimental Design Let’s figure this out together We need a plan We need a data sheet How will you analyze these data? Do we need to modify our hypothesis? B. J. Shaw, American Museum of Natural History

6. Collect Data You need to use calipers for taking precise measurements How to read a Vernier Scale (in mm)

7. Practice What is this measurement?

8. Practice What is this measurement? 8.65mm http://www.southalabama.edu/physics/lab_setup/ph114_201/caliper%20(Small).jpg

9. Analyze Your Data Your data sheet should be an organized table for collecting the measurements

10. Analyze Your Data We discussed different ways of analyzing these data as part of our experimental design Is that still a good approach? –Does this make sense?

11. Analyze Your Data How about a scatterplot, using an estimated least-squares line? –For those of you working with 8 th graders or advanced math students, you can have them calculate it Any other ideas for graphing?

12. Conclusions Was your guess correct? What is the estimated skull length? If you have any unusual data, give an education guess what happened (most likely, human error)

13. For This Lab… Produce an 8½ x 11” or larger “poster” of this experiment Introduction: Background on allometry and Xenarthrans List your citations Methods: Describe your experimental design (include your hypothesis) Results: Include a graph of your data Discussion: Was your prediction correct and what did you learn

14. Be Creative

15. Have Fun

16. What Did You Learn?

17. Include 5 Sections