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Chapter 2 Notes (7)

# Chapter 2 Notes (7) - Left-Skewed Symmetric Right—skewed...

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Unformatted text preview: Left-Skewed Symmetric Right—skewed Right tall Numerical Summaries of Quantitative data In the next two sections, we are going to consider two types of numerical summaries for quantitative data. They are, 0 Center - Spread of the distribution. Section 2.3 Describin th enter of uantitative data There are two commonly used measures for the center of a distribution. a 0 Mean 0 Median - Mode Mean The mean is the sum of the observations divided by the number of observations. Population mean: u An observation' 3: Notation A set of obserVations: x1,x2, x3, ,xn 171+ X2+ X3+'“+Xn n __ amid—mu- Sample mean (i) = _ Ex x=-—-— n ,aarorsunm-cl. ____ --.—---‘.--------.-.. .- __ - _...;....-.._.‘s“‘--_-. .. -- ...
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