Learning Objectives

  • Compute and interpret a range, interquartile range, and semi-interquartile range.
  • Compute and interpret the variance and standard deviation for a population and sample of data using the definitional formula.
  • Compute and interpret the variance and standard deviation for a population and sample of data using the computational formula.
  • Explain why the sample variance and population variance are computed differently.
  • State the characteristics of the standard deviation and explain the empirical rule.
  • Compute the range, variance, and standard deviation using SPSS.