AN INTRODUCTION

TO STATISTICAL METHODS

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THE MACMILLAN COMPANY NEW YORK BOSTON • CHICAGO DALLAS ATLANTA SAN FRANCISCO

MACMILLAN & CO., Limited
LONDON BOMBAY CALCUTTA
MELBOURNE

THE MACMILLAN COMPANY
OF CANADA, LIMITED
TORONTO

STATISTICAL

METHODS

A TEXTBOOK FOR COLLEGE STUDENTS

A MANUAL FOR STATISTICIANS

AND BUSINESS EXECUTIVES

BY

HORACE SECRIST, PH.D.

PROFESSOR OF ECONOMICS AND STATISTICS AND DIRECTOR, THE BUREAU
OF BUSINESS RESEARCH, NORTHWESTERN UNIVERSITY
Author: Readings and Problems in Statistical Methods, Etc.

REVISED EDITION
(Entirely Rewritten and Enlarged)

New York

THE MACMILLAN COMPANY

1933

To

THE MEMORY OF

JOHN FILLMORE HAYFORD,

MY FRIEND AND COUNSELOR

M92247