This book is directed to students of business and sociological studies with no great mathematical knowledge. Clearly such a reader demands a complete and concise description of any mathematical methods that are indispensable to him, but the language of the book is sometimes so condensed as to defeat this end. It begins with chapters on means and measures of dispersion; goes on to time series, least squares and correlation. A chapter each on the normal curve and theory of sampling follow; excellent summaries of methods of collection and presentation and an interesting account of certain special techniques conclude the book. Chapter XII on the normal curve is particularly unsatisfactory. The opening definitions of probability, omitting as they do the concept of "equally likely" are to be condemned. The "product" and "sum" law are also badly presented, while the section on (p + q)x, p. 108, is vague. The areas of the "normal" curve for range S and 2s are quoted on p. 39 before the normal curve has been defined, and moreover the figures given are wrong in the last place of decimals. The grammatical and logical construction of certain particular sentences is also open to criticism. By contrast the chapter on sampling distributions is a good exposition, though misprints of " 10, 000" for " 1, 000" on p. 119 and "as" for "is" on p. 123 could be very misleading. In general Chapter XI on least squares is well presented.
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