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Copyright © Rebecca Rehder Wingerden
Designing a Controlled Experiment
AP Biology Designing a Controlled ExperimentBaseline Investigation: (control group) • Part I: Pillbug Behavior:
- Table 1: General Observation of Pillbug Behavior - Table 2: Pillbug Taxis: Data Collection - Analysis Chi-square: Chi-square Calculation,
Degrees of Freedom, Chi-square Statement (see board)
- Approved Variable
Copyright © 2012 Rebecca Rehder Wingerden
Bozeman Science: Chi-squared Test (12:00 min.) http://www.bozemanscience.com/chi-squared-test
Copyright © 2012 Rebecca Rehder Wingerden
Distributive Behaviors Drawing
Table 1: General Observations of Pill Bug Behavior
Designing a Controlled Experiment
Copyright © 2012 Rebecca Rehder Wingerden
Time # of Pillbugs Side A # of Pillbugs - Side B
1
2
3
4
5
6
7
8
9
10
Average
Table 2: Baseline- Pillbug Taxis
Designing a Controlled Experiment
Designing a Controlled Experiment
Designing Your Investigation (on a whiteboard): • Part II: Pillbug Behavior:
- Purpose: method that will be used, IV and DV. - Hypothesis: If (IV), then (DV), because… - Procedure: Steps discussing how you will modify
the procedure: IV, DV, control and standardized variables.
- Data: table(s) to record findings - Instructor’s Approval
Copyright © 2012 Rebecca Rehder Wingerden
Pill bug behavior and environmental preference. Post Lab Analysis: • Table 2: Pillbug Taxis with Altered (Your group’s
variable) Environmental Condition • Chi-square Analysis #2: Chi-square Calculation,
Degrees of Freedom, Chi-square Statement (see board)
Designing a Controlled Experiment
Copyright © 2012 Rebecca Rehder Wingerden
Post Lab Conclusion (CER): • Restate the purpose of this experiment. • Restate your hypothesis for this experiment. • Statement that answers the following question, “Do the results of your experiment support or refute your hypothesis?”
• Then, list and explain, in detail, how the data that you collected led you to your statement.
• Include statistical test(s) to support your statement. • Therefore, in conclusion… remember your experimental purpose.
Designing a Controlled Experiment
Copyright © 2012 Rebecca Rehder Wingerden