This book was written for first courses in statistics for undergraduate and graduate students in business administration, public administration, and economics.As in previous editions, three principal objectives guided the writings of this book: first, to explain statistical methods used in business and by economists in the clearest possible way; second, to draw case material from real-world situations in order to demonstrate the practical applications of those methods; third, to surround both theory and cases with an abundance of problems, based on real data whenever possible and graded in level of difficulty.