The National Sleep Foundation used a survey to determine whether hours of sleeping per night are independent of age (New
Posted: Sun Jul 10, 2022 10:10 am
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.