Probability and Statistics for Engineering and the Sciences (with Student Suite Online)

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Stat 321 – Day 2 Numerical Summaries (Ch. 1)
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Reminders Reading assignments in syllabus Bring calculator to class Get out, turn on… Lab 1 Include graphs/output Remember labels and legends! Work together!
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Questions? Course Logistics? Blackboard?? Minitab? Ch. 1?
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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
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Numerical Summaries Center Mean = Σ x i / n Median = middle value or average middle pair
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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
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