Question
An ecological group suspects dolphins are consuming dangerous levels of arsenic in a region of the world. Dangerous levels of arsenic are classified when they
An ecological group suspects dolphins are consuming dangerous levels of arsenic in a region of the world. Dangerous levels of arsenic are classified when they reach beyond 7.0 parts per million. A random sample of 28 dolphins in the region were tested and the data is shown in the stemplot.
2|4
2|
3|2 3
3|6 7 9
4|0 1 3
4| 5 7 7
5| 0 1 1 4 4
5| 7 8
6| 3 4
6|6
7|0 1 3
7|5 6 7
Key: 2|4 = 2.4 parts per million
Part A:What proportion of the dolphins in the sample have dangerous levels of arsenic in their systems? (4 points)
Part B:Construct and interpret a 99% confidence interval for the mean arsenic levels of the dolphins if the sample of 28 dolphins has a mean arsenic level of 5.26 parts per million and standard deviation of 1.49 parts per million. (6 points)
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