question archive The EPA wants to know the daily level of pollutant discharge in the manufacturing district in Pittsburgh for February 2005 (i
The EPA wants to know the daily level of pollutant discharge in the manufacturing district in Pittsburgh for February 2005 (i
Subject:StatisticsPrice:2.89 Bought3
The EPA wants to know the daily level of pollutant discharge in the manufacturing district in Pittsburgh for February 2005 (i.e. 28 days). The monitoring equipment reveals that the mean daily discharge per factory (calculated as total areal discharge divided by total areal factories) is 30.2 tons with a standard deviation of 9.1 tons. Construct a confidence interval for the true population mean of pollutant discharge using a 95% level of confidence.
Purchase A New Answer
Custom new solution created by our subject matter experts
GET A QUOTE
Answer Preview
95% CI = ( 26.6714 , 33.7286)
The confidence interval is given by
CI = ?x?? + t*?n?s??
From t tables, at 95% confidence level and n-1=27 degrees of freedom t= 2.052
Hence
CI = 30.2 + 2.052*?28?9.1??
= ( 26.6714 , 33.7286)
