Contaminated water: Polychlorinated biphenyls (PCBs) are a group of synthetic 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. Assume that water sampl are being drawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 80 has a sample mean of 1.90 parts per billion (ppb). Assume the population standard deviation is a = 0.26 ppb. Part 1 of 3
Contaminated water: Polychlorinated biphenyls (PCBs) are a group of synthetic 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. Assume that water sampl are being drawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 80 has a sample mean of 1.90 parts per billion (ppb). Assume the population standard deviation is a = 0.26 ppb. Part 1 of 3
MATLAB: An Introduction with Applications
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(c) How large would the sample need to be so that a 98% confidence interval would have a margin of error of 0.03?
The sample size would need to be
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 alt="Contaminated water: Polychlorinated biphenyls (PCBS) are a group of synthetic 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. Assume that water samples
are being drawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 80 has a sample mean of 1.90 parts per
billion (ppb). Assume the population standard deviation is o = 0.26 ppb.
Part 1 of 3
▬▬
esc
(a) Construct a 98% confidence interval for the PCB concentration. Use tables or technology. Round your answers to at least two decimal places.
The confidence interval is
1.83 1.97
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Transcribed Image Text:Contaminated water: Polychlorinated biphenyls (PCBS) are a group of synthetic 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. Assume that water samples
are being drawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 80 has a sample mean of 1.90 parts per
billion (ppb). Assume the population standard deviation is o = 0.26 ppb.
Part 1 of 3
▬▬
esc
(a) Construct a 98% confidence interval for the PCB concentration. Use tables or technology. Round your answers to at least two decimal places.
The confidence interval is
1.83 1.97
Part 2 of 3
Skip Part
Check
Type here to search
12
2
#
*
3
14
$
4
D
Et
%
5
6
&
7
4+
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