"I know numbers are beautiful. If they aren't beautiful, nothing is."  (Paul Erdos)
Henri Poincare (France, 18541912): Poincare believed that mathematics can be made to fit physical reality. His 491 publications enrich all branches of mathematics. He was the first to use topological methods in algebraic geometry. He is generally considered to be the founder of modern topology. 
When Herkimer was a policeman, why didn't he arrest the judge who was wearing a stolen raincoat? Answer: He believed that you should not book a judge by his cover.
Herky wants to know: If 21 is pronounced twentyone and 31 is pronounced thirtyone, why isn't 11 pronounced onetyone? Why are a wise man and a wise guy opposite things? 
ASSIGNMENT #67 Reading: Review Chapter 10, as necessary. Exercises: Test 10A (handout).

You are working with concepts and ideas fromChapter 10.
In this chapter, we have been working withsituations in which the population standard deviation is known. Thatis, we have worked with sample means that came from a population withknown parameter, s.
Sometimes, however, you take samples from apopulation where the population standard deviation is not known. InChapter 11, we will begin to deal with this situation.
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Text:
The Practice of Statistics, by Yates, Moore, McCabe. New York,W.H. Freeman and Company, 1999. (;l 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)