"For the things of the world cannot be made without a knowledge of mathematics."  (Roger Bacon)
Mathematical Drought in Western World (500  1200): But mathematics was flourishing in the East. And, in the East appeared perhaps the greatest of all Arab mathematicians, Muhammad ibn Musa alKhwarizmi (ca 780  850), who wrote the first known text in elementary algebra. In algebra, you often "balance" an equation to preserve equality by (for instance) adding a like quantity on both sides of the equality. Today's algebra comes from the al jabr, which is balance in Arabic. 
Answer: "Wash your Hans before eating." Herky 's words of wisdom: A day without sunshine is like night. If marriage were outlawed, only outlaws would have inlaws. 
Reading: Prepare for test on Chapter 2. Exercises: Prepare for test on Chapter 2.

A reminder that you can go to the SectionSummaries link where you can review important ideas and conceptsintroduced in Chapter 2 of our text.
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Text:
The Practice of Statistics, by Yates, Moore, McCabe. New York,W.H. Freeman and Company, 1999. (ISBN 0716733706)
Supplemental books:
The Cartoon Guide to Statistics, by Gonick and Smith. NewYork, HarperCollins Publishers, 1993. (ISBN 0062731025)
How to Lie with Statistics, by Darrell Huff. New York, W.W.Norton & Company, 1982 (ISBN 039309426X)