Learning Objectives

  • Describe the purpose of frequency distributions to examine a variable.
     
  • Identify bar charts and pie charts and the types of variables for which they are used.
     
  • Explain the usefulness of a grouped frequency distribution for a quantitative variable.
     
  • Describe the difference between a histogram and a bar chart.
     
  • Describe the difference between a histogram and line graph.
     
  • Discuss the concept of cumulative frequencies and cumulative percentages.
     
  • Identify the shape of a distribution and determine types of skewness.
     
  • Describe time plots and the concept of smoothing data.