As part of the National Health Interview Survey, occupational injury data were collected on thousands of American workers. The table below summarizes part of these data.

(a) Calculate the sample value of the odds ratio.
(b) According to the odds ratio, are self-employed workers more likely, or less likely, to be injured than persons who work for others.
(c) Construct a 95% confidence interval for the population value of the odds ratio.
(d) Interpret the confidence interval from part (b) in the context of this setting.

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Self-employed 210 Employed by others 4.391 Injured? Yes 33.934421,502 Total 33,934 425,893