@book{94764,
	author = {Pfaffenberger, Roger C. and Patterson, James Herbert},
	title = {Statistical methods for business and economics},
	publisher = {R.D. Irwin},
	year = {1981.},
	series = {The Irwin series in quantitative analysis for business},
	address = {Homewood, Ill.},
	edition = {Rev. ed.}
}