Chapter19

# Chapter19 - Chapter 19 Confidence Intervals for Proportions...

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Chapter 19 Confidence Intervals for Proportions

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Example Coral are in decline worldwide, possibly due to pollution or changes in sea temperature. One specific type of coral is a sea fan. Sea fans can be killed by a specific disease called aspergillosis. In June of 2000, a research lab randomly selected some sea fans. They found that 54 of the 104 sea fans they sampled were infected with the disease. What might this say about the prevalence of this disease among all sea fans?
Working with Example We have a sample proportion of Our first guess might be that this number is close to the population proportion, p. However, if we drawn another sample of 104 sea fans, we may not get that 51.9% had been infected. % 9 . 51 104 54 ^ = = p

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(cont.) What can we say about the population proportion, p? Well, we only want to imagine how the sample proportions might vary rather than taking more and more samples.
Finding the Standard Deviation? Since we don’t know p, we can’t find the

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## This note was uploaded on 09/16/2011 for the course AMAT 108 taught by Professor Sutphin during the Fall '07 term at SUNY Albany.

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Chapter19 - Chapter 19 Confidence Intervals for Proportions...

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