Data collection and Sampling - Measures of relative standing and box plots

6 important questions on Data collection and Sampling - Measures of relative standing and box plots

How do you call the pth percentile is the value for which p percent are less than that value and (100-p)% are greater?

percentiles

How do you call the 25th (Q1), 50th (Q2, or median), and 75th (Q3) percentiles?

quartiles

How do you call the the difference between the first and third quartile?

interquartile range (IQR)
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How do you call the pictorial display showing the quartiles and the largest and smallest items of data?

box plot

How do you call an item more than 1.5 (IQR) greater than Q3 or less than Q1?

outlier

What are the three factors that identify when to compute percentiles and quartiles?

  1. Objective: Describe a single set of data
  2. Type of data: Interval or ordinal
  3. Descriptive measurement: Relative standing

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