a. Give a point estimate of the mean mercury concentration after the accident. b. Construct a 95% confidence interval on the mean mercury concentration after the accident. Interpret this interval. c. Is there sufficient evidence that the mean mercury concentration has increased since the accident? (Use = 0.05)
The concentration of mercury in a lake has been monitored for a number of years.
Measurements taken on a weekly basis yielded an average of 1.20 mg/m (milligrams per
cubic meter) with a standard deviation of 0.32 mg/m. Following an accident at a smelter
on the shore of the lake, 15 measurements produced the following mercury
concentrations.
1.60 1.77 1.61 1.08 1.07 1.79 1.34 1.07 1.45 1.59 1.43 2.07 1.16 0.85 2.11
a. Give a point estimate of the
b. Construct a 95% confidence interval on the mean mercury concentration after the
accident. Interpret this interval.
c. Is there sufficient evidence that the mean mercury concentration has increased
since the accident? (Use = 0.05)
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