TA1 - A student asked about the Stem-and-Leaf Diagram,...

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ECO2121: Methods of Economic Statistics TA1 14 Jan 2009 1. Sample Statistics [Exercise 4] Sample Mean n x x n i i = = 1 Sample Variance 1 1 1 ) ( 1 2 1 2 1 2 2 2 1 2 - - = - - = - - = = = = = n n x x n x n x n x x s n i n i i i n i i n i i 2. z -score [Exercise 3] It measures the deviation of a datum from the mean with respect to the standard deviation (population) s m - = x z (sample) s x x z - = 3. Stem-and-Leaf Diagram
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Unformatted text preview: A student asked about the Stem-and-Leaf Diagram, there are many ways of construction, see, for example, (1) http://mathworld.wolfram.com/Stem-and-LeafDiagram.html (2) http://en.wikipedia.org/wiki/Stem_and_leaf_diagram It could be viewed as a “ histogram ” turned 90 ° clockwise. Taylor 14 Jan 2009...
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