The Five-Number Summary gives multiple measures of variability that describe the distribution. A boxplot is the graphic equivalent to a five-number summary. Both show the center and spread of the data, and boxplots can be used to identify skewness and outliers. The five numbers are:
Minimum = smallest number in the distribution
Quartile 1 = Q1, first quartile, 25th percentile, middle of scores between minimum & median
Quartile 2 = Q2, median, second quartile, score at 50th percentile, middle score
Quartile 3 = Q3, third quartile, 75th percentile, middle of scores between median & maximum
Maximum = the sample maximum (largest number in the distribution)
Chapters
0:00 Why do we need data summaries
2:10 The Five Number Summary
4:57 Boxplots
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This video is part of a series for an introductory statistics course. It supports an academic course QBA 237 Basic Business Statistics at Missouri State University, College of Business, Department of Information Technology and Cybersecurity. Posted beginning in August 2022.
This series was designed, written, produced, recorded, edited, and posted by Dr. Todd Daniel, a Ph.D. statistician and researcher with extensive experience in academic statistical research and statistics instruction. Dr. Daniel directed a research institute for many years before doing private consulting for Research by Design, LLC. He remains active in teaching and research.
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Statistics Instructors: you are free to link to this video and the playlist for your seated or online statistics course or for other educational purposes.
Edited in Camtasia 2022
Visual and audio content from DigitalJuice.com
Music: Digital Juice Royalty Free Music
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