The article “Arsenic and Mercury in Lake Whitefish and Burbot Near the Abandoned Giant Mine on Great Slave Lake” (P. Cott, B. Zajdlik, et al., Journal of Great Lakes Research, 2016:223–232) presents measurements of arsenic concentrations in fish found in Northern Canada. a) In a sample of 8 whitefish caught in Yellowknife Bay, the mean arsenic concentration in the liver was 0.32 mg/kg, with a standard deviation of 0.05 mg/kg. Find a 95% confidence interval for the concentration in whitefish found in Yellowknife Bay. b) In a sample of 8 whitefish caught in Baker Pond, the mean arsenic concentration in the liver was 0.55 mg/kg, with a standard deviation of 0.36 mg/kg. Should the Student’s t distribution be used to find a 95% confidence interval for the concentration in whitefish found in Baker Pond? If so, find the confidence interval. If not, explain why not.

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
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Chapter4: Writing Linear Equations
Section: Chapter Questions
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The article “Arsenic and Mercury in Lake Whitefish and Burbot Near the Abandoned Giant
Mine on Great Slave Lake” (P. Cott, B. Zajdlik, et al., Journal of Great Lakes Research,
2016:223–232) presents measurements of arsenic concentrations in fish found in Northern
Canada.
a) In a sample of 8 whitefish caught in Yellowknife Bay, the mean arsenic concentration
in the liver was 0.32 mg/kg, with a standard deviation of 0.05 mg/kg. Find a 95%
confidence interval for the concentration in whitefish found in Yellowknife Bay.
b) In a sample of 8 whitefish caught in Baker Pond, the mean arsenic concentration in the
liver was 0.55 mg/kg, with a standard deviation of 0.36 mg/kg. Should the Student’s t
distribution be used to find a 95% confidence interval for the concentration in
whitefish found in Baker Pond? If so, find the confidence interval. If not, explain why
not.

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