The Centers for Disease Control and Prevention (CDC) wants to estimate the average
extra hospital stay that occurs when heart surgery patients experience postoperative atrial
fibrillation. They divide the United States into nine regions. In each region, hospitals are selected
at random within each hospital size group (small, medium, large). In each hospital, heart surgery
patients are sampled according to known percentages by age group (under 50, 50 to 64, 65 and
over) and gender (male, female). This procedure combines which sampling methods?
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The Centers for Disease Control and Prevention (CDC) wants to estimate the average
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