CORRELATION AND REGRESSION PROBABILITY 3 ANALYSIS OF VARIANCE 1 CENTRAL TENDENCY 1 CHI-SQUARE TEST 1 COLLECTION, EDITING, CLASSIFICATION AND TABULATION OF DATA 1 DISPERSION 1 F-TEST 1 FACTORIAL DESIGN 1 FREQUENCY DISTRIBUTION 1 FREQUENCY DISTRIBUTIONS 1 GRAPHICAL REPRESENTATION 1 INDEX NUMBERS 1 MEASURES OF CENTRAL TENDENCY 1 MEASURES OF VARIATION 1 NEED FOR STATISTICS 1 PRELIMINARY CONCEPTS 1 PROPERTIES AND DISTRIBUTIONS 1 REDUCTION OF ERROR 1 SAMPLING 1 TIME SERIES 1 Z-TEST 1