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For more information, please see full course syllabus of Statistics
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Lecture Comments (4)

0 answers

Post by Jenny Song on October 29, 2015

For extra example 2 for stemplot, why 0 - 8 isn't a cluster?

0 answers

Post by Siyan He on May 25, 2014

For the last example of Stemplot, Shouldn't the cluster be 15-19?
and does 14 consider a gap?

1 answer

Last reply by: Okemwa Monandi Ogega
Sun Aug 11, 2013 10:57 PM

Post by Jameelah Hegazy on October 22, 2012

Excellent demonstrations and explanations. For the first time, I understand left and right skewed.

Related Articles:

Raw Data, Dotplots, Stemplots

  • Raw data is always not processed.

  • Graphs are used to identify a distribution’s center, spread, clusters of data, gaps in the data, and shape.

  • Order the data before computing a stemplot.

  • For a dotplot, ordering the data is not necessary; however, it may make graphing the data a bit easier.

Raw Data, Dotplots, Stemplots

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Raw Data 0:07
    • Ungrouped Data
    • Example: Ages
  • Features of Graphical Displays of Distributions 1:28
    • Center and Spread
    • Clusters and Gaps
    • Outliers (extreme values)
    • Symmetric
    • Skewed
    • Uniform
  • Dotplots 4:58
  • Example: Dotplots 8:51
  • Stemplot 11:12
    • Stem and Leaf
  • Example: Stemplot 15:18
  • Extra Example 1
  • Extra Example 2