Manufacturing and Product Development Grade 40s grease mohair must have a fiber diameter of approximately 24 microns. A manufacturer of mohair jackets received a large shipment of 40s-grade raw material and obtained 30 random measurements of fiber diameter. The manufacturer can only assume that the underlying distribution of fiber diameters is continuous. Is there any evidence to suggest that the median diameter is different from 24 microns? Use a significance level of a = 0.05.