Describe the relevant population and the sample. b) Are the numbers 22% and 17% associated with the population or a sample?

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3. Research suggests that depression significantly increases the risk of developing dementia later in life. Suppose that in a study involving 949 elderly persons, it was found that 22% of those who had depression went on to develop dementia, compared to only 17% of those who did not have depression.

a) Describe the relevant population and the sample.
b) Are the numbers 22% and 17% associated with the population or a sample?

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