Math 151 , Spring 2006, Day 5 Wednesday Feb. 8 Hit reload Clarified #D

In Computer Lab, Mac 101.  Bring text; disk to save on (containing your circle data if possible.)
Handout: 8 sides with Index on the 8th.  Extras will be in the white folder outside my door.  Links off index page at  Activstats &SPSS Info.
In class:
Read page 1, Work through page 2, at least to Changing properties + + +,
Page 3:  Start by putting pulse only into Dependent list: OK.  Examine output. 
  Then add height to Dependent list.  Open the Statistics button, Check Percentiles. (We'll learn what these are next class.)    OK.  Examine output.
  (Optional: Open Options button.  Explore the difference between listwise and pairwise exclusion (there are 25 pulses & 26 heights) by getting and examining the output each way.)
  Move hair (coded) to Factors box, OK, examine output.
Start to print (p.1), using print preview. (Don't print.) Be sure to Select output beforehand.
Page 4: Interactive graphs.  Do histogram, dotplot shown.
Page 7: Import a file
More time?  Page 5, Two categorical variables, starting with CircleSRS1.sav. 

Day 5 (Wed. Feb. 8): Reading: Finish D&V Ch5, AS Ch5 (D&V, and I, will do medians, quartiles, boxplots first, then mean/s.d.  AS does middles, then spreads, then boxplots.)

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HOMEWORK DAY 5:  Hand in each problem as it is finished.  All 5 by next Wednesday, Day 8. (We'll learn quartiles, 5-number summary, boxplots Day 6)
Use SPSS unless otherwise instructed.  They don't have to be done in order.
Print all graphs; copy down numbers onto the paper instead of printing those big tables.

A.  From the text: #32, Ch4 p 32.  Drunk driving (These comments:)
a) Use  the SPSS  dotplot (Handout p.4) instead of a histogram.  Also get the SPSS stem&leaf (Handout p.3).
b)  Timeplot: We haven't discussed these, but it shouldn't be hard. D&V pp. 43-4. Handout p.8.  If you can't get the connect-the-dots, connect them on the paper with pencil.
c) As written, discuss.

B. Investigate the issue with data wrongly labeled Nominal or Ordinal. Use the file
Studat for SPSS (Which you changed and saved after working p. 2)
(SPSS for class 05\ Studat complete is what you should have gotten; use that one if you don't have yours.)
Make a dot plot and a histogram of Pulse. Now change the Measure for Pulse to Ordinal, in the Data Editor.
Try making a dot plot and a histogram of Pulse again. (The icon for Pulse should now not be a ruler. If it is, hit Reset, so the icon becomes the 3 towers. Then proceed.) Print the graphs, compare to the first graph(s),  and write on your paper what has happened, and what is wrong with the Ordinal graph(s).

C.  Import your Circle data into SPSS.  If you don't have your data, use SPSS for class 05\ CircleSRSlapptr , my data from my laptop
Be sure to check the Measure column, Variable View of Data Editor. Quantitative variables need to be Scale measure. Make graphs and/or calculate summary numbers which address 3 of the questions in the Question list.  (Current list of questions you can answer with one person's data, Back of this handout) Write up your results.

D. Contingency tables and Using Pre-piled data in SPSS (like two-variables part of Chapter 3)
(This re-creates the work on p. 6 of the handout)
a) Use CircleSRS1.sav to create a contingency table with percents of Color conditioned on Hand. And a Segmented Bar Chart.
b) Now open and examine CircleSRS1 hand&color prepiled.sav and create a contingency table with percents conditioned on Hand. And a Segmented Bar Chart.  The results should be identical for the two files.  Print them out to hand in.
c) Use your own Circle data (imported in part C) and create your contingency table (Should match what you tallied by hand.) 

E.  From the text: #28, Ch4p 54.  Cholesterol & Smoking Note Group "1" in the data file is Smokers, Group "2" is Ex (by examining the data, or using View: Value labels, which have been put on here)
   Find the histograms asked for.
   Then find side-by-side dotplots.  And Boxplots. (These come out nicer if the Measure of Group is made Ordinal)
   And find the two 5-number summaries, and the IQRs.
Write your brief report using this information. 
Also tell which graphical display you like best for these: histograms, dotplots, or boxplots.

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Questions on Circle Experiment  (As of Feb. 8  See link for complete current version.)

On Average:
    What was my average speed?
    How fast was my R/L hand?   What was the difference?
    How far from center was my R/L hand?  What was the difference?
    Average distance between circles? [design of experiment]
[What about spreads?]

Which hand:  R/L, Dominant/Nondominant
   Was faster?  (by how much?)
     Easier to use? [can we tell from recorded data?]
     More accurate? (by how much?)

Colors:
    What color occured most frequently? [design of experiment]  (done!!)
     Did color make a difference?  if so,
     What color did I respond to faster/ relationship between color and speed/accuracy?
     What color was best for you? [how can we measure this?]
 
Size:
  How did size affect accuracy of hitting the center?
    What size was easier to see? [how can we measure this?]

Distance:   Did the time increase (accuracy decrease) as the distance increased?
 More accurate moving up/down or side-to-side?  [can we measure this?]

Did accuracy improve over Time?

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