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

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  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 a simple random sample of non-autistic children from the same school district.

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

c.      A nutritional exam in applied to a random sample of individuals. Results are compared to expected means and proportions.

 
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