Introduction To Statistics And Data Analysis

6th Edition

ISBN: 9781337793612

Author: PECK, Roxy.

Publisher: Cengage Learning,

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Textbook Question

Chapter 2.1, Problem 4E

The article “Adolescents Living the 24/7 Lifestyle: Effects of Caffeine and Technology on Sleep Duration and Daytime Functioning” (Pediatrics [2009]: e1005-e1010) describes a study in which researchers investigated whether there is a relationship between amount of sleep and caffeine consumption. They found that teenagers who usually get less than 8 hours of sleep on school nights were more likely to report falling asleep during school and to consume more caffeine on average than teenagers who usually get 8 to 10 hours of sleep on school nights.

a. Is the study described an observational study or an experiment?
b. Is it reasonable to conclude that getting less than 8 hours of sleep on school nights causes teenagers to fall asleep during school and to consume more caffeine, on average? Explain. (Hint; Look at Table 2.1.)

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Chapter 2.1, Problem 3E

Chapter 2.1, Problem 5E

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Chapter 2 Solutions

Introduction To Statistics And Data Analysis

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Solution Summary: The author explains that an observational study is a process of making conclusion based on the observed characteristics of one or more population. An experiment deals with studying effect of explanatory variable on dependent or response variable.

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