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Lesson 3 & 4 Components
I. Presentation 3: Data introduction and Osprey Example View description Download files
II. Bald Eagle Activity 1 View description Download files
III. Bald Eagle Activity 2 View description Download files
IV. Bald Eagle Activity 3 View description Download files
Download introduction, outline, glossary, and bibliography for entire unit (all 5 lessons)
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I. Presentation 3: Data introduction and Osprey Example
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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
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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"
    
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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 go to top of page
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" go to top of page
"BaldEagleActivity3_WB_KEY"
"Baldeagle3 presentation"  
"BE3graph"  
"BaldEagleActivity3_datasheets"  
"EagleExAct3"  
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