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.

Question

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.

What value is typed into the field for Sample Mean?

A) 1.2
B) 2.1
C) 2.3
D) 81

Is it 2.1?

Answer 1

No, it is not 2.1. The value that should be typed into the field for the Sample Mean is the mean hospital stay calculated from the records at the hospital, which is 2.3 days. The correct answer is C) 2.3.