Many medical studies have used a large sample of subjects from Framingham, Massachusetts who have been followed since 1948. A recent study (Annals of Internal Medicine , vol. 138, pp. 24€“32, 2003) gave the contingency table shown for weight at a baseline time and then 20 years later.

a. Find the sample proportion with normal weight at
(i) Baseline
(ii) 20 years later.
b. Identify the two samples and whether they are independent or dependent. Explain.

Transcribed Image Text:

20 Years after Baseline Normal Baseline Normal Overweight Overweight 368 827 695 87