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Estimate the average extra hospital stay

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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?

Multiple Choice

-Cluster, stratified, and simple random

-Judgment, systematic, and simple random

-Systematic, simple random, and convenience

-Convenience, systematic, and judgment

Reference no: EM132849078

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