Mathematics, 27.11.2019 05:31 mathiscool7
In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels of lead. construct 90% confidence interval for the proportion of water specimens that contain detectable levels of lead.
Answers: 2
. The estimated standard deviation is given by 
. Because we have a large sample, the 90% confidence interval for p is given by 
where 
is the value that satisfies that above this and under the standard normal density there is an area of 0.05. So, the confidence interval is 
, i.e., (0.4958, 0.7422).
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