I.
Presentation 3: Data introduction and Osprey Example 

Description

• 
Introduces
students to CEETV, the Contaminants Exposure and Effects  Terrestrial
Vertebrates database, as a source of data that can be used to investigate
the effectiveness of the DDT ban. 
•

Reviews
how to formulate a hypothesis and determine the type of data needed
in order to reduce potential bias. 
•

Uses
osprey data from CEETV to explore the effectiveness of the DDT ban 


Goals 
•

Students
lean about data sources available to the public 
•

Students
practice formulating a hypothesis and selecting data in a manner that
minimizes bias. 
•

Students
gain an appreciation for graphing as a way to visualize data. 

Download
Files for Presentation 3 

• 
“TeacherManual3_4”
( if not downloaded previously) 

• 
“Lesson3_dataintro_presentation”


• 
“Lesson3_WB”


• 
“Lesson3_WB_KEY”


• 
"osprey"


II.
Bald Eagle Activity 1 

Description


• 
Students are given a dataset
from CEETV containing data on DDE concentrations in bald eagle eggs
in the U.S. 

• 
Students are introduced
to Microsoft Excel and some of its functions 

• 
Students sort their data
and eliminate records that would introduce bias. 
• 
Students divide records
into groups by year and calculate DDE averages for each group. 
• 
Students graph their results
and discuss the meaning of their graphs. 
Goals 

• 
Students practice formulating
a hypothesis and sorting a dataset to remove records that would introduce
bias into the investigation. 

• 
Students
learn how to manipulate data and graph using Microsoft Excel 

• 
Students
discuss the meaning of their graph and explore possible explanations
for the pattern they observe. 




Download
Files for Bald Eagle Activity 1 

• 
“TeacherManual3_4”
(if not downloaded previously) 
• 
“baldeagle
presentation ” 

• 
“BaldEagleActivity1_WB” 

• 
"BaldEagleActivity1_WB_KEY" 
• 
"baldeagle" 
• 
"BaldEagleActivity1_Excel" 
• 
"EagleExAct1" 



III.
Bald Eagle Activity 2 
Description


• 
Students look at the records
they used to create the graph in Bald Eagle Activity 1 and propose
a possible hypothesis to explain their results. In particular, they
are encouraged to question whether the trend they observe is a trend
across the U.S. or limited to specific locations. 

• 
Students
reexamine their data by dividing data into groups by state, discuss
the results, and formulate a new hypothesis. 




Goals 

• 
Students gain further
comfort and expertise with manipulating data and graphing in Excel 

• 
Students explore
how different ways of dividing and visualizing data can lead to different
results and hence conclusions. 




Download
Files for Bald Eagle Activity 2 

• 
“TeacherManual3_4”
(if not downloaded previously) 
• 
"BaldEagleActivity2_WB" 

• 
"BaldEagleActivity2_WB_KEY" 

• 
“EagleExAct2_KEY” 

• 
"BaldEagleActivity2_Excel" 

• 
"Baldeagle2
presentation" 




IV.
Bald Eagle Activity 3 

Description 

• 
The results of Bald Eagle
Activity 2 are discussed with emphasis on how bias was introduced
to the first investigation. 

• 
Students are asked to
share their results and new hypotheses. Santa Catalina is identified
as a potential hotspot. 

• 
Students investigate their
new hypothesis by looking at the bald eagle data one last time. This
time they contemplate a graph in which the bald eagle data has been
divided into 2 large datasets, one containing all U.S. data with the
exception of data from Santa Catalina and the other dataset containing
data only from Santa Catalina. 

• 
Students discuss the meaning
of their graphs and formulate ideas about what might have caused the
patterns they observe. 

• 
Students discuss how combining
the data records in different ways led to a different result thereby
reviewing ideas about bias presented earlier in the unit. 




Goals 

• 
Students develop critical
thinking skills with regard to science, in particular by identifying
sources of bias. 




Downloads
for Bald Eagle Activity 3 

• 
"BaldEagleActivity3_WB" 

• 
"BaldEagleActivity3_WB_KEY" 
• 
"Baldeagle3
presentation" 

• 
"BE3graph" 

• 
"BaldEagleActivity3_datasheets" 

• 
"EagleExAct3" 
