Homework 5
Assigned: 05 October 2007
Due: 12 October 2007
..\sta402\hw\Homework-05-0oct07.doc (*.pdf)
1. Refer to the 4 group (packaging method)- log-bacterial growth study. In this exercise, you
will use SAS/GRAPH to construct figures displaying the means and standard deviations.
a. Construct a figure containing side-by-side boxplots using the INTERPOL=BOX option
associated with a SYMBOL statement used with PROC GPLOT.
b. Construct a figure with the data points plotted. Superimpose the mean plus/minus 2 std.
deviation segments on this plot.
c. Construct a horizontal bar chart with the end of the bar at the value of the mean with a 1 SD
whisker extending from this bar.
2. Refer to the nitrofen data. Generate a plot of the nitrofen data (sqrt total as response) vs.
concentration. Superimpose the fitted quadratic model. Only use GPLOT to generate this figure
– i.e. don’t use PROC REG to generate fits first, I want you to use the SYMBOL INTERPOL reg
options.
3. Refer to the nitrofen data. Generate a scatterplot of TOTAL vs. CONC (with jittering in the
concentration direction). Make sure the plot has an appropriate title describing the plot and
footnote commenting on the jittering. In addition, add a vertical reference line separating the
data from the lowest 3 concentration groups and the higher concentration groups, and add text
(annotate the plot) with a note about "reduced brood 2/3 survival in higher concentrations."
4. Find a data set that interests you and generate a display that best represents it using
SAS/GRAPH.
