Includes index

Introduction; Interpretation of statistics -- Accuracy and approximation -- Population and sample; Methods of collection -- Random samples; Other sampling methods -- Tables -- Introduction; Principles of graph construction; moving totals and moving averages; Z charts; Lorenz curves ;semi-log graphs -- Pictorial representations; Bar charts; Pie charts -- Arrays and ungrouped frequency distributions; Grouped frequency distributions --Histograms; Frequency polygons and frequency curves; ogive --Fractiles of ungrouped frequency distributions; Fractiles of grouped frequency distributions -- Medians, mean and modes -- Average means; Geometric and harmonic means -- Dispersion and skewed -- Scattergraphs -- Regression lines -- Correlation -- Time series -- Inex numbers -- probability -- Probability distributions -- Sampling theory.