MATH 251, Probability and Statistics I, Fall 2001, Mon. Nov. 12, Day 31

Add your shoebox results to each of  the 2 sheets circulating.  n =4, sigma =4, sigmaxbar =2
    the 4 values || xbar|| z (assuming mean is 20)|| P-value= P(Z > z) || Is P-value < .10?
Add a dot for each of your xbars to the dotplot transparency circulating.

Questions on Confidence Intervals?

Significance tests use an elaborate vocabulary, but the basic idea is simple: an outcome that would "rarely" happen if a claim were true--is good evidence that the claim is NOT true.   Summary notes Day 30
Read Tests of Significance (sec. 6.2).  If the rest is solid, read  pp. 463-466 "two-sided tests and confidence intervals"
Next: 6.3.  We will either omit or postpone 6.4; I am anxious to get through chapter 7.
Hand in:   Sec. 6.2 
(from last sheet:)
Hypotheses:  H0 is what you would like to prove false!about the population.
p. 468, 6.26, 27, 29
Finding p-values
6.34 sonnets
6.35 attitudesof older students
6.36 corn yield (2 sided)

(new)
6.30, 6.33 explain p-value
6.38 Guatemala calcium--large n-->small p, even when difference slight.		 Read, discuss 
p. 470 6.31 explain p-value.		 Optional 

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