Numerical Measures of Central Tendency and Variability

Read these sections and complete the questions at the end of each section. First, we will define central tendency and introduce mean, median, and mode. We will then elaborate on median and mean and discusses their strengths and weaknesses in measuring central tendency. Finally, we'll address variability, range, interquartile range, variance, and the standard deviation. 

Measures of Variability


  1. 8 - 2 = 6

  2. The variance would be larger if these numbers represented a sample because you would divide by \mathrm{N-1} (instead of just \mathrm{N}).

  3. 3.2842

  4. 25th% = 10, 75th% = 19, 19 - 10 = 9