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Identify whether the studies described here are based on (1) single samples, (2) paired samples, or (3) independent samples. a.Cardiovascular disease risk factors are compared

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

a.Cardiovascular disease risk factors are compared in husbands and wives.

b.A nutritional exam is applied to a random sample of individuals. Results are compared to the results of the whole nation.

c.An investigator compares vaccination histories in 30 autistic schoolchildren to a simple random sample of non-autistic children from the same school district.

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