The National Sleep Foundation used a survey to determine whether hours of sleeping per night are independent of age (New

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answerhappygod
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The National Sleep Foundation used a survey to determine whether hours of sleeping per night are independent of age (New

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The National Sleep Foundation used a survey to determine whetherhours of sleeping per night are independent of age(Newsweek, January 19, 2004). The following show the hoursof sleep on weeknights for a sample of individuals age 49 andyounger and for a sample of individuals age 50 and older.
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