Topic_4.0___Descriptive_Statistics

Topic_4.0___Descriptive_Statistics - Descriptive Statistics...

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Descriptive Statistics Ash Genaidy
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Introduction Statistical analysis consists of two elements: Descriptive statistics Inferential statistics Descriptive statistics are ways of describing a sample.
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Topic Outline Tabular and graphical methods Measures of central tendency Measures of variation
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Overview of tabular and graphical methods A frequency distribution of the sample measurements summarizes the counts of responses for a set of intervals of possible values. A relative frequency distribution reports this information in the form of percentages or proportions.
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Overview of tabular and graphical methods A histogram provides a picture of this distribution. It is a bar graph of relative frequencies. The histogram shows whether the distribution is approximately bell-shaped, U-shaped, skewed to the right (longer tail pointing to the right), or whatever.
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Frequency distribution for motorcycle data Manufacturer Frequency Relative Frequency 1. Honda 41 .34 2. Yamaha 27 .23 3. Kawasaki 20 .17 4. Suzuki 18 .15 5. Harley-Davidson 3 .03 6. Other 11 .09 120 1.01
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Histogram for motorcycle data 0.34 0.23 0.17 0.15 0.03 0.09 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 honda yamaha kawasaki suzuki harley-d other
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Overview of tabular and graphical methods The stem and leaf plot is an alternative way
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Topic_4.0___Descriptive_Statistics - Descriptive Statistics...

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