Normal Distribution - Amount of Sleep

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Statistical Concepts Name: __________________________ 1 180215 Normal Distribution - Amount of Sleep D o we humans get enough amount of sleep we need? Here is what some experts are saying... " There is increasing evidence that there is a very strong relationship between sleep quality and physical and mental health... " A national survey of 31,044 adults revealed a link between insomnia and other sleeping problems with high blood pressure, heart failure, anxiety, and depression. Experts say that there is no evidence yet to indicate that acquiring more sleep will improve medical conditions, but some studies have shown that more sleep makes teenagers do better in school. The US National Sleep Foundation suggests that an adult needs seven to nine hours of sleep a night . The Foun dation conducted a survey in 201 2 that suggested about 75% of Americans had sleeping problems, with one - third being so sleepy during the day that it affected their lives and activities. On the other hand, when asked if everyone needed 8 hours of sleep each night, some experts stated: " It's nonsense. It's like saying everybody should have size eight shoes, or should wear Medium size clothes. .. However, t here is a normal distribution with the average sleep length seven and a quarter hours. " M any people report their sleeping hours more or less than the average, and that the determining factor for a req uired amount of sleep should be whether the person feels fresh and alert during the day, the same experts say. While amount or quality of sleep undergoes a wide variety of changes during the human life span (based primarily upon age and life style ), all aspects of sleep, at any given age, have a relatively normal, bell - shaped distribution.
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