In DB7, the standard deviation of bone density of 18 patients with femoral neck fractures is s 5 24.01. Take the standard deviation for the normal population as σ 5 16.12. We want to know whether or not the variability for patients with a fracture is unusually larger than that for normals and therefore probably different. If we sampled repeatedly from the normal population, how often would we find an s this large or larger? (Hint: By calculating χ

2 as before, what percentage of the area under the curve is greater than that value of χ2

?)