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STAT1051_lesson2

STAT1051_lesson2 - Descriptive Statistics Quantitative Data...

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Descriptive Statistics Quantitative Data
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2 Quantitative Data Measurements that can be measured on a natural and meaningful numerical scale Examples: a) SAT score of students b) The current unemployment rate for 50 states c) Number of calls made over last week by 10 cell phone users
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3 Discovering the Distribution When we summarize quantitative data we want to see the underlying distribution of the variable. Some of the values are more likely than others. DISTRIBUTION describes how the observations are spread over the range of the data.
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4 Summarizing Quantitative Data Graphical/Tabular Methods: Stem and Leaf Plot Frequency/Relative Frequency Distribution Histogram
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5 Graphical Methods for Describing Quantitative Data The Data
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6 Illustration: Dot Plot MPG data
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7 Illustration: Stem Plot MPG Data:
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8 Illustration: Histogram MPG data
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9 Stem and Leaf Plot Every observation is divided into two parts.
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