For next time: Back in 121. We'll continue with the Normal distribution.
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 completer
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 are not in the book's lists.
Data files can be downloaded here(corrected, 9/10):
Eagles young, text. Eaglesyoung, SPSS por. Eaglesyoung, SPSS sav. Eagles& DDE, text. Eagles& DDE, SPSS por.
Eagles& DDE, SPSS sav
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