Researchers in the Adirondack mountains collect data on a random sample of streams each year. One of the variables recorded in the substrate of the streams-the type of soil and rock over which they flow. The researchers found that 69 of the 172 sampled streams had substrate of shale. Construct a 95% confidence interval for the proportion of Adirondack streams with a shale substrate.

the answer is d

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the correct answer is the second option

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