=+11.4 Each person in a random sample of 228 male teenagers and a random sample of 306
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=+11.4 Each person in a random sample of 228 male teenagers and a random sample of 306 female teenagers was asked how many hours he or she spent online in a typical week (Ipsos, January 25, 2006). The sample mean and standard deviation were 15.1 hours and 11.4 hours for males and 14.1 and 11.8 for females.
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Related Book For 
Statistics The Exploration And Analysis Of Data
ISBN: 9781111804138
6th Edition
Authors: John M Scheb, Jay Devore, Roxy Peck
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