Topic: Center, Spread and Position

Quartile Conventions in Hand Calculations and Software

Percentiles as Measures of Relative Standing

Percentile Values Versus Percentile Ranks

Multiplying Observations by a Constant

Interpreting Positive and Negative Z Scores

Interpolated Percentiles in Software

How Extreme Observations Affect Summaries

Finding the Median in an Odd-Sized Data Set

Finding the Median in an Even-Sized Data Set

Finding Percentiles With the Nearest-Rank Rule