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Unformatted text preview: is weekly income in hundreds of rupees from the sample mean. (To get Z i from Y i , change the units to hundreds, and then take deviations from the mean.) a. What is the value of ? Z Explain. b. What is the relationship between 2 Z s and 2 Y s ? c. What are the units of s XY and s XZ ? What is the relationship between s XY and s XZ ? d. Show that XY XZ r r ....
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 Spring '12
 BENCIVENGA
 Economics

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