About This Chapter
Data & Surveys in Statistics - Chapter Summary
Our professional instructors assembled these lessons to provide you with a way to improve your understanding of how data is collected and analyzed. You will find that these lessons cover information regarding the use of surveys, polls, statistical analysis and visual interpretations. Some of the specific topics covered in them include:
- Calculations for the mean, median, mode and range of a data set
- Visual representations and analyses of distributions
- Calculations for standard deviation
- Designs for survey studies
- Differences between populations and samples
- Uses of statistical models
- Sources of bias in polls and surveys
After each lesson, don't forget to complete the lesson's quiz. These short assessments will not only help you identify topics you don't understand, but will also provide you with links to the parts of the lessons that discussed those topics. After you've completed the lesson quizzes and studied the topics you missed, be sure to take the chapter's practice exam for an additional assessment of your knowledge.
1. How to Calculate Mean, Median, Mode & Range
Measures of central tendency can provide valuable information about a set of data. In this lesson, explore how to calculate the mean, median, mode and range of any given data set.
2. Visual Representations of a Data Set: Shape, Symmetry & Skewness
Visual representations are a fantastic way of understanding and analyzing your data. Use this lesson to understand the characteristics of visual representations of data.
3. Calculating the Standard Deviation
In this lesson, we will examine the meaning and process of calculating the standard deviation of a data set. Standard deviation can help to determine if the data set is a normal distribution.
4. Survey Study: Definition & Design
Although most of us know what a survey is, many do not know all the tools necessary to create a survey that will yield quality data. In this lesson, you will learn about such tools.
5. Difference between Populations & Samples in Statistics
Before you start collecting any information, it is important to understand the differences between population and samples. This lesson will show you how!
6. The Purpose of Statistical Models
Understanding statistics requires that you understand statistical models. This lesson will help you understand the purpose of statistics, statistical models, and types of variables.
7. Bias in Polls & Surveys: Definition, Common Sources & Examples
When Mark Twain commented that there were three types of lies, he included statistics in the count. In this lesson, we look at bias, one of the ways in which statistics can mislead, and in some cases, flat out lie to us.
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