Ch 27: Dispersion & Frequency Distributions in Statistics

About This Chapter

Use this chapter to ensure you understand the important statistics topics of frequency distributions and dispersion. Our engaging video lessons walk you through these topics in an easy-to-follow way so you can get a great score on an exam or homework assignment.

Dispersion & Frequency Distributions in Statistics - Chapter Summary

In this informative statistics chapter, you could learn about normal distribution, also known as the bell curve, and find out why this distribution is so important. Lessons cover the different kinds of random variables as well as both relative frequency and frequency tables. Other important topics include the measures of central tendency and their use specifically in the field of psychology. Once you complete these lessons, you will be ready to:

  • Explain what it means for a graph to have skew
  • Use regression analysis to understand data
  • Analyze large amounts of information using cumulative frequency tables
  • Name the different measures of variability

Watch our short video lessons as quick and easy learning tools, and then take the self-assessment quizzes to see how well you understood. You can jump to any section of a video lesson by using the video tabs feature in the Timeline. Study at any time that's convenient for you by accessing these materials on any computer, tablet or mobile phone 24 hours a day.

8 Lessons in Chapter 27: Dispersion & Frequency Distributions in Statistics
Test your knowledge with a 30-question chapter practice test
Measures of Dispersion and Skewness

1. Measures of Dispersion and Skewness

Watch this video lesson to learn how you can describe your data using two different statistical characteristics. Learn what it means for your graph to have variability and what it means for your graph to be skewed.

Normal Distribution: Definition, Properties, Characteristics & Example

2. Normal Distribution: Definition, Properties, Characteristics & Example

In this lesson, we will look at the Normal Distribution, more commonly known as the Bell Curve. We'll look at some of its fascinating properties and learn why it is one of the most important distributions in the study of data.

Regression Analysis: Definition & Examples

3. Regression Analysis: Definition & Examples

Watch this video lesson to learn about regression analysis and how you can use it to help you analyze and better understand data that you receive from surveys or observations. Learn what is involved in regression analysis and what to look out for.

Random Variables: Definition, Types & Examples

4. Random Variables: Definition, Types & Examples

This lesson defines the term random variables in the context of probability. You'll learn about certain properties of random variables and the different types of random variables.

Frequency & Relative Frequency Tables: Definition & Examples

5. Frequency & Relative Frequency Tables: Definition & Examples

Frequency and relative frequency tables are a good way to visualize information. This is especially useful for information that is grouped into categories where you are looking for popularity or mode.

Cumulative Frequency Tables: Definition, Uses & Examples

6. Cumulative Frequency Tables: Definition, Uses & Examples

Cumulative frequency tables can help you analyze and understand large amounts of information. In this lesson, you practice creating and interpreting cumulative frequency tables.

Central Tendency: Measures, Definition & Examples

7. Central Tendency: Measures, Definition & Examples

Explore the measures of central tendency. Learn more about mean, median, and mode and how they are used in the field of psychology. At the end, test your knowledge with a short quiz.

Variability in Statistics: Definition & Measures

8. Variability in Statistics: Definition & Measures

Variability is a measure of the spread of a data set. Learn more about the different measures of variability including the range, variance, and standard deviation, and the way in which they are used in the field of psychology.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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