65. In a study of copper de ciency in cattle, the copper values (mg/100 mL blood) were determined both for cattle grazing in an area known to have well-de ned molybdenum anomalies (metal values in excess of the normal range of regional variation) and for cattle grazing in a nonanomalous area ( An Investigation into Copper De ciency in Cattle in the Southern Pennines, J. Agric. Soc. Cambridge, 1972:
157—163), resulting in s1  21.5 (m  48) for the anomalous condition and s219.45 (n45) for the nonanomalous condition.Test for the equality versus inequality of population variances at signi cance level .10 by using the P-value approach.