Ch 2: Scientific Validity

About This Chapter

Make your study of the accuracy of scientific validity easy with this comprehensive chapter. Build your confidence in your knowledge of these topics ahead of a certification or placement exam by reviewing our short video and text lessons and testing yourself with our multiple-choice quizzes.

Scientific Validity - Chapter Summary

Lesson topics in this thorough chapter include the importance of accuracy and precision while taking scientific measurements and how validity can be improved in your own investigations. Learn how to spot an unavoidable experimental error and then reduce it while investigating. Additional studies review why the order of magnitude is so closely related to scientific notation. After you have worked through these lessons, you should be able to:

  • Understand how to discover the order of magnitude in real-life examples
  • Identify possible sources of bias to avoid them in your investigations
  • Detail the importance of repeated trials and know how to analyze them

If you prefer to work offline, many of our lessons offer printable transcripts that highlight vocabulary words and important concepts. Otherwise, you can access all the materials we offer in these chapters on your mobile phone, computer or tablet at any time. The help of one of our professional instructors is available if you find that you need it. Choose to watch an entire video lesson or use the video tabs feature to skip ahead directly to the subject you want to review.

6 Lessons in Chapter 2: Scientific Validity
Test your knowledge with a 30-question chapter practice test
Measurements & Uncertainty in Science

1. Measurements & Uncertainty in Science

In this lesson, you will discover the importance of precision and accuracy in science while learning to make measurements. Also, you will understand how to perform calculations with measurements that conserve precision and limit uncertainty.

Order of Magnitude: Definition & Examples

2. Order of Magnitude: Definition & Examples

In this lesson, you will learn the definition of order of magnitude and how it is closely associated with scientific notation. You will also learn how to determine the quantity of orders of magnitude in numbers with interesting real-life examples. Following the lesson will be a brief quiz.

How to Improve Validity of a Scientific Investigation

3. How to Improve Validity of a Scientific Investigation

This lesson explores one important measure of the quality of a scientific experiment: validity. Learn what validity is and how it can be improved in a scientific investigation.

Identifying Sources of Unavoidable Experimental Error

4. Identifying Sources of Unavoidable Experimental Error

Good data are essential for any experiment. But no matter how hard you try, error in your data is unavoidable. In this lesson, you'll learn about the types of unavoidable experimental error to be on the lookout for and how to reduce their occurrence in your data.

How to Avoid Bias in Scientific Investigations

5. How to Avoid Bias in Scientific Investigations

In this lesson, you will learn what it takes to conduct a proper scientific investigation while doing your best to avoid any possibility of bias. Learn where possible sources of bias can come from and what you can do about it.

Repeated Trials: Definition & Purpose

6. Repeated Trials: Definition & Purpose

Repeated trials make the data you collect in experiments more reliable. Learn what repeated trials are, and find out how to record, organize, and analyze them.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.