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Data Analysis and Statistics for Geography, Environmental Science, and Engineering
book

Data Analysis and Statistics for Geography, Environmental Science, and Engineering

by Miguel F. Acevedo
December 2012
Beginner content levelBeginner
557 pages
19h 5m
English
CRC Press
Content preview from Data Analysis and Statistics for Geography, Environmental Science, and Engineering
157More on Inferential Statistics
> binom.test(5,20,p=0.2)
Exact binomial test
data: 5 and 20
number of successes = 5, number of trials = 20, p-value = 0.5764
alternative hypothesis: true probability of success is not equal to
0.2
95 percent confidence interval:
0.08657147 0.49104587
sample estimates:
probability of success
0.25
>
We get a high p-value indicating that we should not reject a 20% grass cover. In addition, the 95%
condence interval indicates that 20% is within the interval for 25% estimate in cover. In this case,
we conclude that the cover could be 20%.
For comparison, suppose we count eight sample sites covered with grass. Now
> binom.test(8,20,p=0.2) ...
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Publisher Resources

ISBN: 9781439885017