Polychlorinated biphenyls (PCBs) are a group of synthetic oil-like chemicals that were
Chapter 5, Problem 12(choose chapter or problem)
Polychlorinated biphenyls (PCBs) are a group of syn- thetic oil-like chemicals that were at one time widely used as insulation in electrical equipment and were discharged into rivers. They were discovered to be a health hazard and were banned in the 1970s. Since then, much effort has gone into monitoring PCB concentrations in waterways. Assume that water samples are being drawn from a waterway in order to estimate the PCB concentration.
Suppose that a random sample of size 80 has a sample mean of \(1.69 \mathrm{ppb}\) and a sample standard deviation of \(0.25 \mathrm{ppb}\). Find a 95% confidence interval for the PCB concentration.
Estimate the sample size needed so that a 95% confidence interval will specify the population mean to within \(\pm 0.02 \mathrm{ppb})
Equation Transcription:
Text Transcription:
1.69 ppb
0.25 ppb
\pm 0.02 ppb
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