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A 95% confidence interval for the mean duration of hospital stay following a particular procedure was found to be 1.3 to 3.1 days. The margin

A 95% confidence interval for the mean duration of hospital stay following a particular procedure was found to be 1.3 to 3.1 days. The margin of error is?

a.3.1

b.1.8

c.1.3

d.0.9

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