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Stat 321 – Day 2

Stat 321 – Day 2. Numerical Summaries (Ch. 1). Reminders. Reading assignments in syllabus Bring calculator to class Get out, turn on… Lab 1 Include graphs/output Remember labels and legends! Work together!. Questions?. Course Logistics? Blackboard?? Minitab? Ch. 1?.

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Stat 321 – Day 2

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  1. Stat 321 – Day 2 Numerical Summaries (Ch. 1)

  2. Reminders • Reading assignments in syllabus • Bring calculator to class • Get out, turn on… • Lab 1 • Include graphs/output • Remember labels and legends! • Work together!

  3. Questions? • Course Logistics? • Blackboard?? • Minitab? • Ch. 1?

  4. Last Time – Quantitative Data • Graphical summaries • Histograms, stem-and-leaf plots, dotplots • Describe shape, center, spread, unusual observations (extreme, unique numerical values) • Typical value… how closely do the values cluster around this typical value… • Numerical summaries

  5. Numerical Summaries • Center • Mean = Sxi/n • Median = middle value or average middle pair

  6. Demo 1: Rower weights • Def: A measure is resistant if its value is not strongly affected by the presence of outliers in the data set. • Mean? • Median? • The University of North Carolina took a survey of the students who had graduated as geology majors. In 1998, the average annual salary of geology majors who graduated from UNC was more than $500,000. • The next year it was less than $100,000.

  7. Example 1: Cancer Pamphlets • Calculate the mean? • Calculate the median? • Since the median readability= median reading level, does this imply that the pamphlets are well matched to the patients’ reading levels?

  8. * Boxplots • Can hide some details • Best used to compare datasets Fourth spread fu + 1.5 fs

  9. For Thursday • Finish reading Ch. 1 • Begin HW 1 (to be posted online) • Continue working on Lab 1 • Blackboard survey?

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