7. A study conducted by the Defenders of Wildlife examined the typical mercury c

Question

7. A study conducted by the Defenders of Wildlife examined the typical mercury concentration in cans of tuna sold in stores. The Defenders collected a sample consisting of 20 cans of albacore tuna and 144 cans of light tuna from stores across the United States. The boxplots below summarize the mercury concentrations found in the sampled cans (in parts per million, ppm). Albacore Light 0 0.1 0.2 0.3 0.4 0.5 0.8 0.7 0.8 0.9 . 12 13 1.4 1.5 1.8 Mercury Concentration (ppm) True and False: (1) The majority of light tunas have mercury concentration greater than 3.5ppm. (2) At least 25% of the light tuna have a mercury concentration less than the lowest mercury concentration in Albacore tuna. (3) The lowest mercury concentration of albacore tuna is no less than the median mercury concentration of light tuna. (4) Light tuna tends to have a lower mercury concentration than albacore tuna. But, light tuna has more variability in mercury concentration than does albacore tuna.

Explanation / Answer

1) False, because the maximum value is 0.8 with some outliers

2) True

3) True

4) True

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