Sample of individuals from around the country

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Reference no: EM131816810

"Drinking water rich in minerals, or hard water, may play a role in reducing heart disease, Finnish researchers say."43 For one of these study designs, it would be appropriate to summarize results with a correlation; which is it? For the other designs, tell why correlation would not be appropriate.

a. Take a sample of individuals from around the country; record the hardness (parts per million of calcium carbonate) of water where they live, and whether they die of a heart attack.

b. Take a sample of communities from around the country; record the hardness (parts per million of calcium carbonate) of water in each community, and the rate of death by heart attack.

c. Take a sample of communities from around the country; record whether the water in each community is hard or soft, and record the rate of death by heart attack in each community.

d. Take a sample of individuals from around the country; record whether the water where they live is hard or soft, and whether they die of a heart attack.

Reference no: EM131816810

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