Math 151 , Spring 2006, Day 13 Mon Feb. 27 Hit reload... After class

Exams  not finished.  Sorry!
Day 13(Mon. Feb. 27): Reading: Finish D&V Ch6 pp. 86-98.  (Questions 2&3 p.92-3 are optional. Normal Prob. Plots p. 94-95 is  Optional, but don't miss What Can Go Wrong, p95 bottom).  AS Ch. 6, in order. Note AS 6-4 ¶1, Normal table does UPPER tail.  Almost all normal tables do LOWER tail.
Then: Quick Review p.103. 
Next, D&V Ch7 Scatterplots, first thru 117 (AS7-1&2), then Correlation, the rest. (AS7-3&4)
Technology:http://www.whfreeman.com/scc/ , Statistical Applets, Normal Density.  Uncheck the 2-tail box for most uses.  OR ActivStats Normal Density Tool : for best setup Use AS30-2 "Normal distribution based Confidence Intervals tool" CAUTION: Don't hit the Enter key! It closes the tool-box!
Hand in (All D&V)  (Finally)
Raw data problems. .  "Backward" parts  are marked with *. 
You have done these with a technology tool (see above). Now do them with table Z also. 
p.102,  25 Cholesterol  a, b, c,  d*, e* 
26 Tires  a, b, c,  d*, e* 
28 Body Temperatures: a, b, c*  Also:  I have a theory as to where the "wrong" number 98.6F came from.
 Early work on temperatures all took place in Europe. Convert 98.6F and 98.2F to Celsius (subtract 32, and divide by 1.8).  What's my theory?
= = = = = = = = = = = = = = = = = =
Scatterplots (Ch. 7): 
p. 130, 5,6 describing simple plots
 1,4 what relationship ALSO sketch an appropriate scatterplot for each. 
  8 Derby (This is actually a timeplot)ALSO, how does the variability  change over the decades? 
 9 Pottery For a, dotplot is ok instead of histo.  ALSO, is Batch # really Quantitative, or Ordinal? 

Postpone SPSS
SPSS Handout: Repeat the work of page 1, and do problems 1-5 on p. 3.  Keep this work and hand it all in when all problems have been assigned. 

Read, 
 to discuss 		 Optional  (more practice)
Normal Probability Practice handout.
&&&&&&&
with table Z:
p.102, 27 Kindergarten a,b*,c*
 <>p.109, 25 BeQuick a,b,c,d,e*,f*
= = = = = = = = = = = = =
If you feel at all shaky about graphing or using straight lines (slopes, intercepts) be sure to do Linear Equations exercise
 and Line Equations, Activstats 8-1, activities 3&4
(in preparation for Ch.8)

National Survey of Student Engagement,  we ask that you respond to it:
Looking ahead to Chapter 12:  "Nonresponse bias"--people who don't answer your questionnaire are different from people who do, but we can't know how...so it's important to respond.

Handout: Normal probability practice  (Parts are here)
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
<>Using z tables to go between raw values and proportions (percentiles)  See Day 10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Relationships:(D&V Ch 7 thru p.117, AS7-1&2  )
Handout on SPSS Scatterplots etc. (D&V Ch. 7-10, AS 7,8,9)  pp.1-3, p.4
govsal_vs_pay.sav  is the file used for most of the handout. (In SPSS for Class 05 folder)

    Did 2 categorical variables (2-way tables), quantitative vs. categorical (side-by-side boxplots, stemplots, histo's)
Relating 2 quantitative variables:  Scatterplots
  explanatory = predictor = independent = "x" = horizontal axis ( = "cause", only sometimes!)
                       response =    dependent   = "y" =  vertical axis      = ("effect ")

(Living histograms:  Height vs. weight, Height vs. gpa)
Timeplot (p.43-4) is special case, "time" on x axis.

Discussing Scatterplot :
Unusual features?   Clusters (analyze each separately)?     Outliers? (label if possible; who?, why?)
For simple cloud, line, or curve:
Form (linear, curved, ...?)
    Strength of relationship (how un-scattered)  "Weak, moderate, strong"
Direction
    Positively associated:  y increases as x increases (generally).
    Negatively associated:  y decreases as x increases.

Start here Wednesday:
Mark subgroups differently to do comparisons. (Subgroups defined by categorical variable, like Sex, Region of country)
  Some scatterplot data:  educ-v-mortality.sav  ,   studatsp03.sav
Handout on SPSS Scatterplots etc. (D&V Ch. 7-10, AS 7,8,9)
govsal_vs_pay.sav  is the file used for most of the handout. (In SPSS for Class 05 folder)
Sievers home  Math151-Sp06/Daysp13.htm  2pm 2/27/06
This page belongs to Sally Sievers who is solely responsible for its content. Please see our statement of responsibility.