Chapter Summary

This chapter introduces the concepts of data reduction, basic measures of central tendency (mean, median and mode), dispersion (minimum, maximum, range, variance and standard deviation), the z-score and the chi-square test.

A simple data set is provided in the text, along with step-by-step examples of basic calculations for variance, standard deviation, z-score and chi-square.

Chapter Objectives

This chapter will help you:

• Describe the concept of descriptive statistics and provide examples.
• Describe the concept of data reduction and provide examples.
• Explain and calculate the following statistical measures:
  
  • Mean, median, and mode
  • Minimum, maximum, range, variance, and standard deviation
  • z score
  • Chi-square