Ind 



ex 



A-B blood groups, 56 

 ACE test scores, 10, 11, 16, 23, 25, 41 

 Addition theorem, for the chi-square 

 distribution, 141 



for probabilities, 53 

 Approximation of binomial distribution 



by normal, 87, 101 

 Arley, Niels, 75, 242 

 Atkeson, F. W., 140 

 Averages, arithmetic mean, 13 



geometric mean, 20 



harmonic mean, 21 



median, 19 



midrange, 12 



mode, 20 



properties of, 12 



Barmore, Mark, 221 

 Bartley, E. E., 181 

 Batting averages, 47, 93 

 Binomial coefficients, 65, 254 

 Binomial frequency distribution, 77, 79 

 Binomial probability function, 68 

 Bivariate population, 198 

 Blood factors, A-B, 56 



M-N, 60 



P, 60 



Rh, 60 

 Buch, K. Rander, 75, 242 



Central 95 per cent, 124, 125, 126 

 Chi-square, empirical distribution for 1 

 D/F, 133 

 probability distribution table for 1, 2, 



and 3 D/F, 252 

 use in testing Ho(p = po), 132 

 use in testing Ho(pi = Pi), 136 

 use in testing Ho(p\:p2'P3 = 



P1-P2-P3'), 144 



use with contingency tables, 143 

 CI 95 , 124 



Classes of events, 51 



Class interval, length of, 23, 28 



midpoint of, 28 

 Clopper, C. J., 126 



Coefficient of correlation, product-mo- 

 ment, 217, 224 



rank, 227 

 Coefficient of linear regression, 199, 224 

 Compound probability law, 55 

 Confidence coefficient, 122, 165, 214 

 Confidence interval, based on (?-distri- 

 bution, 183 



length of, 169 



observed examples of, 166 



on the correlation coefficient, p, 220 



on the mean, n, 165 



on fii — H2, 179 



on /iy. x , 213 



on iiy. Xi , 214 



on the proportion, p, in a binomial 

 population, 124, 127 



on the regression coefficient, /3, 211 

 Contingency tables, 136, 143 

 Control limits, 148 



Correlation coefficient, computation of, 

 217, 224 



hypotheses about, 218 



product-moment, 217 



rank, 227 

 Cumulative distribution curve, 23, 25 

 Cumulative frequency table, 23, 25 

 Curvilinear trends, 196, 197 



Decisions based on samples, 114 

 Degrees of freedom (D/F), for chi- 

 square, 134, 142 

 for estimate of correlation, 209, 218 

 for estimate of regression, 209, 211 

 for estimate of standard deviation of 

 regression, b, 211 



259 



