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According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3 days with a standard deviation of 1.2 days.

Test the claim that the mean hospital stay after childbirth for this hospital is significantly longer than the national mean of 2.1 days.

Enter the requested information. Click Calculate.

Locate the standard error of the mean in your output. What is the standard error and how does StatCrunch calculate it?

A) 1.2, the standard deviation of the sample.
B) 0.1333, computed by s/n
C) 0.1333, the standard error of the mean, computed by mathml equation
D) 0.1333, the standard deviation computed by mathml equation

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1 answer
  1. s/(sqrt((n))

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