"It isn't that they can't see the solution. It is that the can't see the problem."  (G. K. Chesterton)
Mathematical Drought in Western World (500  1200): The Islamic world represented fertile ground for both mathematical development and the preservation of ancient mathematical knowledge during the Middle Ages. The city of Baghdad (now the capital of Iraq) was established in 766 and became a flourishing intellectual center where, among other things, important works of the ancient Greeks where translated into Arabic for study. 
Answer: My grain headache. Herky 's words of wisdom: Birthdays are good for you  the more you have, the longer you live. In just two days, tomorrow will be yesterday. 
Reading: Section 3.1, pages 107  112. Exercises: 3.1, 3.2, 3.3 (WNIB), 3.5

You are in Section 3.1.
It is suggested that you look at pages 187  188in The Cartoon Guide toStatistics.
A very important thought that you should alwayskeep in mind: While there may be a fairly obvious relationshipbetween two variables, it does not follow that one causes the other.Association does not implycausation.
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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)