Data from the National Health Interview Survey (NHIS): Group Sample Size Health Status Std. Error Hospital No Hospital 7,774 3.21 0.014 90,049 3.93 0.003 Notes: Health status ranges from 1 (poor health) to 5 (excellent health). Taken from Angrist and Pischke, 2009. 4 "During the past 12 months, was the respondent a patient in a hospital overnight?" + "Would you say your health in general is excellent, very good, good, fair, or poor?"

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.