Math 151 , Fall '08, Fri., Sept 19, Day 10.. Hit reload..

HW :  Ch. 3: Standardizing to standard normal pp.74-76, "Check" 3.21.  NOW, rest of chapter.  We WILL learn to use table A. Moore doesn't separate out reading the z-table in the following; focus on just the z-table parts on first reading:  p. 76-80, Cum. proportion and  normal.  "Check" 3.22, 3. 23."Backward" from prop. to z pp. 81-83.  We'll now revisit and learn to deal with x's.     

Hand in Monday :  
Rest of  SPSS.  Day 6

Reading and questions:  due Mon. Day 11
"None of the above" article by Malcolm Gladwell  on reserve and outside my door. 
Questions: 1) What is the Flynn effect?
2) What is a likely reason for it?

= = Finish these (Yes, for Monday)
Standardize (find z-scores) for all the "x's".  Find Answers with Applet.  Also calculate them using table.= =
= =  Using table with "x"'s--"raw" values. = = = =
 Begin these by drawing and labeling the appropriate normal curve for each question, leaving space for computation.  Normal templates-may help. Then use the Applet: Normal Density Curve on your CD or at   http://bcs.whfreeman.com/bps4e. to find the required values.  Write these on your paper.  Next, calculate the values using Table A.  Your answers from each method should be very close (the Table gives a bit more accuracy than the Applet.)
p. 87, 3.37 Jacob's score, and 3.39 top score. Mean, s.d. are before 3.32 on p. 86.
p. 87, 3.46 surprising difference in tails
A. , What proportion of pregnancies last 310 days or more? Find Mean and s.d. in p.74, 3.7 (more next time on this) 
p. 80-81 3.11 and 3.12 (locomotive adhesion, 2 dist's)

Read,
to discuss

 Optional (more practice) 
 
 

= = = = = = = = 
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p. 75 3.8  SAT & ACT (Standardize)

~ ~ ~ ~ ~ ~ ~
You can finish all but 3.53 of the rest, using the Applet, and now calculating your Table A answers.
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p. 86 3.30 z's to proportions
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"Backward" 
p. 86, 3.31 (backward z)
p. 89, 3.53
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First hourly exam, TODAY Sept. 19, Day 10 (next class).
Sample exam (link should work now) handed out. All problems are "included."  solutions are linked here. 13B solution is missing. See below. Closed book, but bring one sheet of notes (anything you like) and a calculator.  I will give you a sheet with the Normal tables on it.
   Exam will cover thru what was assigned Monday (Through standardization and using Normal table for z's ), Plus reading SPSS output.  You may be asked to read SPSS output (as we see it on the sample exam), but not how to produce it. 
   You may  start early and/or stay late, if you don't have another class. Let me know ahead on clipboard. Not before 9(?) You don't have to work in the classroom;  you just have to sign in and say where you'll go (in the building!), on the clipboard.  If you want more than an hour, and have obligations before and after--or other problems-- see or email me to make a plan by this afternoon!
(Starting at a time Fri. other  than 9:30? Come to my office!)

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Next:  Using Standardizing and the Standard Normal Table to do more general problems.
Day 8 for details.

Solution for Sample exam 13B: (see Day 7 for details on the technique, appropriate style of drawing.)
Find the z value with 20% of the area above it. This is the same as the z with 80% below it. 80% = .8000
Look in the body of the table for the number closest to .8000. That is .7995. Look to the left and top margins in the row and column of .7995 to find that z = .84.

Sievers home  Math151-Fall08/Dayf9.htm  3pm 9/17/08
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