# Medical: REM Sleep REM (rapid eye movement) sleep is sleep

## Problem 9 Chapter 9.5

Understandable Statistics | 9th Edition

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Problem 9

Medical: REM Sleep REM (rapid eye movement) sleep is sleep during which most dreams occur. Each night a person has both REM and non-REM sleep. However, it is thought that children have more REM sleep than adults (Reference: Secrets of Sleep by Dr. A. Borbely). Assume that REM sleep time is normally distributed for both children and adults. A random sample of n1 10 children (9 years old) showed that they had an average REM sleep time of hours per night. From previous studies, it is known that s1 0.5 hour. Another random sample of n2 10 adults showed that they had an average REM sleep time of hours per night. Previous studies show that s2 0.7 hour. Do these data indicate that, on average, children tend to have more REM sleep than adults? Use a 1% level of significance.

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Lecture 1 Nicole Rubenstein August 28, 2017 1 Overview & Introduction Probability Concepts (STAT 3375): ▯ Chapter 2: Basic Probability ▯ Chapter 3: Discrete Probability Distributions ▯ Chapter 4: Continuous Probability Distributions ▯ Chapter 5: Multivariate Probability Distributions ▯ Chapter 6: Transformations of Random Variables...

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