About This Chapter
Planning a Scientific Investigation - Chapter Summary
Review the characteristics of a well-designed scientific experiment with the help of our knowledgeable instructors. You'll take another look at how to develop a hypothesis; identify independent, dependent, and control variables; set up your experiment's parameters; and select experimental and control groups.
Instructors also weigh the pros and cons of various experimental designs - including between-groups, within-groups, single-factor, and multiple-factor designs - before outlining the effects of confounding, extraneous, and moderator variables on an experiment's outcome. By the time you finish this chapter, you should be familiar with the following:
- The experimental design process
- Components of a true experiment
- Types of experimental designs
- Effects of research variables
Instruction is delivered through short, illustrated video and text lessons that make it easy to study the steps involved in planning a scientific investigation. Transcripts with links to supplementary text lessons and self-checking quizzes are also included. Access them as many times as you need and use the video tags or lesson summaries to revisit key terms and topics of interest.
1. Designing an Experiment to Test a Given Hypothesis
A well-written hypothesis is the key to any well-designed experiment. In this lesson, we'll work through the process of designing an experiment based on the hypothesis it's meant to test and see how the two work to complement each other.
2. The True Experimental Research Design
You need to set up a true experiment to test a hypothesis and demonstrate a cause and effect relationship. This lesson will teach you how this is accomplished and when you are forced to use other research designs.
3. Advantages & Disadvantages of Various Experimental Designs
There are many different options for researchers when deciding how to run a study. In this lesson, we'll look at some of the advantages and disadvantages of some common experimental designs.
4. Research Variables: Dependent, Independent, Control, Extraneous & Moderator
This lesson explores the terminology of experimental design. What are variables? How do they influence each other? Is it possible that you are seeing connections that don't actually exist?
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Other chapters within the College Physics: Help & Review course
- Scientific Inquiry
- Formulating Scientific Questions
- Observation and Data Collection
- Data Analysis and Graphing
- Drawing and Explaining Conclusions
- Safety During Science Experiments
- Scientific Ethics
- Motion and Newton's Laws
- Kinematic Equations in Physics
- Properties of Rotational Motion
- Linear Momentum Principles
- Work, Energy and Power
- Heat and Thermodynamics
- Characteristics of Waves
- Electrical & Magnetic Forces
- Electric Potential & Capacitance
- Physics Circuits
- Magnetic Forces and Fields
- Quantum Mechanics and the Standard Model
- Science Literacy
- Diversity in Science
- Historical Perspectives in Physics
- Science, Technology and Beliefs