MATH 251, Probability and Statistics I, Fall 2005, Wed. Sept.7, Day 6After Class Added Sep10

SPSS is on the computers in Mac 101, also on the 3 Dell computers in the Soc. Sci. lab, Mac 304.
Let me and Frank Lacomb (flacomb@wells.edu) know if any computer refuses to run SPSS (missing, says license is expired).
Last HW.  Keep it if you had trouble.  We'll discuss it next time.
SPSS Introduction HANDOUT.  (Extras in Red file folder with pink top  stripe outside my door)
Work through as much as you can in class, then finish doing or reading Pages 1 thru 5, 7, 8, and 10 top.
Correction p. 8. ta_01_005 is Tornadoes, not Hurricanes.
Addendum:  It may be that you get no labels on your graphs! Yes. If so, go to the Data Editor,  Variable View, and type in appropriate labels in the Labels column--or Delete the apparently empty space.  Redo your graphs.  (If there are Labels, SPSS uses them to label graphs.  If not, it should revert to using the variable Names; but Moore's .por files appear to have a "space" character in the Labels column.  "Old wing" processes figure it out--"New wing" processes use the space.)

For next time: Back in 121. We'll continue with the Normal distribution.

 Math 251 Homework Day 6 (Wednesday, Sept.7). (all with SPSS)  Due Wednesday, Sept. 14, Day 10.  Hand in each problem as you finish it!

A. 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 \ 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).

B. Import the text file ex01_035.txt (It's in Math251\Data Sets\Text\Ch1)
    Do p. 37 1.35a (study hours) using parallel boxplots instead of stemplots, with this data set.  What did you need to do to make the file data usable?  Now open the SPSS file ex01_035.por (It's in Math251\Data Sets\SPSS\Ch1) .  What is wrong with this file? You may not see the difficulty if you use the boxplots you get under the old wing Analyze>Descriptive>Explore (p. 3, handout).  Do theGraphs>Interactive>Boxplot (new wing) graph (p. 5, middle, for details)
and you'll see the difficulty.
Moral:  Check the Measure column in Variable view--for every data set!

C. p. 35. 1.29 (Thinness). Use a histogram. Also find the five-number summary and a boxplot.

D.  Redo p.38, 1.37b,d  (Day 2)(IQ, GPA); use histograms (side by side) instead of stemplots. Then do p. 59 1.54 (mean, s, median)  (Hand this one in along with E.)
E.  Use the data of the problem above (1.37, 1.54, table 1.9) You found the mean and standard deviation  of IQ there.  Use these values to make a new variable of standardized values of IQ  (Transform>Compute: Handout p. 8)  Make a histogram of the standardized values to hand in.  Save the file for yourself, for future use.
(You could print the data set, but it would take 3 pages.  In the Data Editor, do Print Preview and look.  Don't bother.).

F.  Timeplot (Read pp. 19-24.  Know meaning of "trend" and "seasonal variation"; we won't calculate them now.)  Do p. 97, 1.138 (eagles & DDT).  Data files not given.  Watch this web-space for link to download data, unless you feel like typing them in, as I will have to do.... Data files, thanks to Yan: 
Eagles& DDT, text.  Eagles& DDT, SPSS por.  Eagles& DDE, text.  Eagles& DDE, SPSS por.

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