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STAT 1770 (14)
Lecture

September 18.docx

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Department
Statistics
Course
STAT 1770
Professor
John Sheriff
Semester
Fall

Description
September 18, 2013 Chpt 2 Sec 1­4 Pages 43­54, 57­66 Other graphical summaries of Quantitative Data • Dot Plot o Each observation represented by a dot placed above its value on a number  line  Most useful for smaller  data sets • Stem leaf plot o Each observation divided into  two parts  Stem: Leading digits  Leaf: (usually) last digit o List stems vertically from  smallest to largest including  stems without leaves o Attach each leaf to appropriate  stem Numerical summaries of quantitative data: • Measures of the centre • Mean o The arithimetic average of all the data values
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