Document 76L83d5w6D789qQ2O3N3jrbe

ABD00078263 A SPEARMAN'S RANK COEFFICIENT TEST DAILY MEAN VCM RESIDUAL CONCENTRATIONS i Procedure is to rank daily means and then to square the difference of ranking. Day Daily Mean 1 71.88 2 68.92 3 71.55 4 68.90 5 72.61 Rank 4 2 3 1 5 Difference -3 0 0 3 0 Square Of Difference 9 0 0 9 0 Spearman's Rank Coefficient s 1 - 6lld i2 n^ -n Where d i2 = square of differences n = number of samples 9 0 d = 0 n =5 Then: Spearman's Rank Coefficient = 1 - 6(9+Q+0+9+Q) = 0.10 125 - 5 for n = 5, the critical value for significance is + 0.90^^ Therefore, since the calculated rank coefficient, 0.10 is less than the critical value, 0.90, there is no significant difference in the mean daily averages. 0) Chemical Rubber Handbook Tables for Probability of Statistics Published by Chemical Rubber Company, 1966, page 330 RAF