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(a) Define each of the following terms. i. Simple random sampling. ii. Stratified random sampling. (b) Why might a researcher prefer to take a stratified

(a) Define each of the following terms.

i. Simple random sampling.

ii. Stratified random sampling.

(b) Why might a researcher prefer to take a stratified random sample rather than a simple random sample? Give two reasons.

(c) You have been asked to design a nationwide survey in your country to find out about the smoking habits of adults. Give two stratification factors you might use, and explain why you have chosen them.

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