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  3. figure 426 shows a scatterplot of the acidity ph for...

Question: figure 426 shows a scatterplot of the acidity ph for...

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4.84 Mercury Levels in Fish Figure 4.26 shows a scatterplot of the acidity (pH for a sample of n 53 Florida lakes vs the average mercury level (ppm found in fish taken from each lake. The full dataset is introduced in Data 2A and is available in FloridaLakes. There appears to be a negative trend in the scatterplot, and we wish to test whether there is significant evidence of a negative association between pH and mercury levels. 1.4 1.2 1.0 0.8 0.6 a 0.4 0.2 0.0 pH Figure 4.26 Water pH vs mercury levels of fish in Florida lakes (a) What are the null and alternative hypotheses? (b) For these data, a statistical software package produces the following output r -0.575 p-value 0.000017 Use the p-value to givethe conclusion of the test. Include an assessment of the strength of the evidence and state your resultin terms of rejecting or failing to reject Ho and in terms of pH and mercury (c) Is this convincing evidence that low pH causes the average mercury level in fish to increase? Why or why not?

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