PCBs have been in use since 1929, mainly in the electrical industry, but it was not until
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a. Legislation was passed in the 1970s restricting the production and use of PCBs. Thus, the active input of PCBs from current local sources has been severely curtailed. Do the data provide evidence that there has been a significant decrease in the mean PCB content of herring gull eggs?
b. Estimate the size of the decrease in mean PCB content from 1982 to 1996, using a 95% confidence interval.
c. Evaluate the conditions necessary to validly test the hypotheses and construct the confidence intervals using the collected data.
d. Does the independence condition appear to be violated?
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Related Book For
An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker
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