"Important formulas" (1 folded page) inserted.; Includes bibliographical references (p. [801]-802) and index.; The nature of probability and statistics -- Frequency distributions and graphs -- Data description -- Counting techniques -- Probability -- Discrete probability distributions -- The normal distribution -- Confidence intervals and sample size -- Hypothesis testing -- Testing the difference between two means, two variances and two proportions -- Correlation and regression -- Chi-square and analysis of variance (ANOVA);