Question

In two wards for elderly women in a geriatric hospital the following levels of haemoglobin were found:

Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5, 12.2, 11.9, 13.6, 12.7, 13.4, 13.7 g/dl;

Ward B: 11.9, 10.7, 12.3, 13.9, 11.1, 11.2, 13.3, 11.4, 12.0, 11.1 g/dl.

The summary statistic is given below:

Sample 1 (control) Sample 2

n 12 10

y¯ 12.45 11.89   

s 1.07 1.03

Is there a significant difference between the mean levels in the two wards? Use α = 0.05

Answer 1