Math 151 , Fall 2002, Wednesday, Sept. 11, Day 6

In Lab with SPSS.
Handout: 6 sides with HW on the 6th.  Extras will be in the yellow folder outside my door.

Read p. 1, Work through pp 2, 3.  Start to print (p.1), using print preview.
Import a file (p. 4):  Import Table 2.2, Moore p. 90.
  Is there any effect of order of measurement on this data set? Make a timeplot of  Mass on Case number.

HW repeated here:
Homework, Day 6 (Due Monday)
 Use SPSS unless otherwise instructed.  Print all graphs; you may copy down numbers onto the paper instead of printing them.  Hand in Monday.

A.  Investigate the issue with data wrongly labeled Ordinal.  Use the file Studat for SPSS (completed as you did in class) (Studat complete is the result 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.  Make a dot plot and a histogram of Pulse again.  Print the graphs and write on your paper what has happened, and what is wrong with the Ordinal graph(s).

Moore p. 44, 1.42. (again) Import that data set.  Call the variables Group and Data.
Get the mean and s.d. for groups A and B (the Group column is your "factor").
Get side by side dotplots by putting the Data on the horizontal axis and the Group variable on the vertical axis. Print the dotplots, copy off the means and s.d.'s.
SPSS won't do back to back stemplots.  Which do you prefer for comparing--Dot or Stemplot?

Moore p. 27, 1.24.  (Teacher's pay) Import the data (It's Table 1-6). (If that doesn't work, use Table1_6f.sav in SPSS for class folder.)
Make a histogram and a stemplot in SPSS.
Find the 5-number summary, the mean, and the IQR for Teacher's pay.
Make side-by side boxplots for Teacher's pay for the 9 different regions.  Do you see any difference in pay across regions?

Moore p. 70 1.75a,b,c,+  (Drive times)
First import the data. (It is one long column in Ex01_75) Now save your file.
   Do a, (by hand or with SPSS).  Do b.
   For  part c, find the mean, median,  and standard deviation of the whole set,
       then delete the 3 outliers  (click on the gray case number to select the row, hit delete key),
   find the mean, median,  and standard deviation without them.  How have they changed?
   ALSO make a histogram with a normal curve on it (data without outliers)
        (Don't save the data file again or you'll lose those 3 outliers forever.)
    (Alternative to deleting: Select the subset you want, using something like 6.6 <drivtm & drivtm < 9.8)

Moore p. 71 1.77 (chicken feed) Do it with SPSS, like the others.