Value of Repeated Experiments
The student is expected to perform repeated investigations to increase the reliability of results.
The student uses scientific inquiry methods during laboratory and outdoor investigations.
Data, Statistics: Visionlearning (website) - Detailed information on statistical terminology, the role of statistics in describing data variability and reliability, and the relationships between variables. Includes references for further reading and links to related learning modules.
Good Stress: BioEd Online (website) - Students gather data on hand muscle strength by repeatedly squeezing a clothespin. Several trials over succeeding days, with data collected and compared each time.
- Supporting Lessons
- Assessment Ideas
- Literature Connections
- Additional Resources
Forces: Discovery Education (website) - Students build a simulated luge track to investigate friction, wind resistance, slope, force and gravity. Before starting the activity, students should discuss the variables to be considered, including force and friction. Multiple trials should be completed.
Elaboration Lessons and Extensions
Balloon Car: PBS Kids (PDF) - Simple, fun investigation demonstrates that repeated trials increase the reliability of test results, and that changing a single variable can alter outcomes significantly.
After completing one or more of the lessons on this page, have students record their observations and calculations in their science notebooks. Have each student write a paragraph that describes how the results did or did not change as a result of repeating their investigations.
What’s the Plan? Designing Your Experiment. Hyde, Natalie (ISBN-13: 978-0778751540)
Solving Science Questions: A Book About the Scientific Process. Chappell, Rachel M. (ISBN-13: 978-1600445422)
Elementary School Design Packet: NASA eClips (PDF) - Introduction to a formal process for designing and testing a product or experiment to solve a given scientific problem.