Question: Sampling designs. Identify whether the studies described here are based on (1) single samples, (2) paired samples, or (3) independent samples. (a) An investigator compares

Sampling designs. Identify whether the studies described here are based on (1) single samples, (2) paired samples, or (3) independent samples.

(a) An investigator compares vaccination histories in 30 autistic schoolchildren to an SRS of nonautistic children from the same school district.

(b) Cardiovascular disease risk factors are compared in husbands and wives.

(c) A nutritional exam is applied to a random sample of individuals.

Results are compared to expected means and proportions.

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