@book{132706,
	author = {Ravid, Ruth. and ebrary, Inc.},
	title = {Practical statistics for educators},
	publisher = {Rowman & Littlefield,},
	year = {2010.},
	address = {Lanham, MD :},
	edition = {4th ed.},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10437313}
}