STA 6166 – Fall 2010
Part 1: ChiSquare Test for Association
A study was conducted, investigating the prevalence of
Baylisascaris procyonis
eggs in
Procyon lotor
fecal samples during 4 seasons of the year. The following contingency table
classifies sampled
Procyon lotor
fecal samples by season and presence/absence of of
Baylisascaris procyonis
eggs.
Season
Fecal Samples with eggs
Fecal Samples w/out eggs
JulyAugust
5
46
SeptemberNovember
45
61
DecemberFebruary
2
22
MarchMay
4
92
Obtain a table of expected cell counts, under the hypothesis that the prevalence of the eggs
in fecal samples is independent of season.
Conduct the Pearson chisquare test to determine whether the prevalence of the eggs in fecal
samples is independent of season (
α
=0.05).
Obtain a cluster bar graph of egg presence/absence in fecal samples, separately by season.
Part 2: Relative Risk and Odds Ratio
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 Fall '08
 Staff
 ChiSquare Test, Linear Regression, Regression Analysis, fecal samples, r. igh, lotor fecal samples

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