Chapter 2 Notes (1)

Chapter 2 Notes (1) - Chapter 2: Descriptive Statistics...

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Descriptive Statistics Chap Ways to summarize data h Numerically h Graphically Example : Consider the top driving What’s the strata? pter 2: Descriptive Statistics speeds of students from a large statistics class: Page 1
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Descriptive Statistics Stem & Leaf Diagram h Popular method that shows h Divide observations into ste Example: Height of students (displ 62 64 65 66 66 67 67 68 69 70 71 71 Histogram h puts data in categories h can display frequency or re Speeding example…. s shape of data with minimal loss of data tems and leaves. layed in inches) 1 71 72 73 elative frequency Page 2
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Descriptive Statistics Page 3 Dataset Shape Symmetric Skewed Right Skewed Left Bimodal x frequency 0 5 10 15 20 0 500 1000 1500 2000 2500 y 0 5 10 15 20 25 10 20 30 40 50 z -5 0 5 10 15 20 25 a 7 8 9 10 11 12 100 200 300 400
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Descriptive Statistics Page 4 Outliers Outliers h data values that are not consistent with the bulk of the data h should never be discarded or ignored without proper justification Why an outlier may exist: h Mistake in measurement or recording h Data point belongs to a different group h
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Chapter 2 Notes (1) - Chapter 2: Descriptive Statistics...

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