Concept explainers
Reading at Bedtime It is well-documented that watching TV, working on a computer, or any other activity involving artificial light can be harmful to sleep patterns. Researchers wanted to determine if the artificial light from e-Readers also disrupted sleep. In the study, 12 young adults were given either an iPad or printed book for four hours before bedtime. Then, they switched reading devices. Whether the individual received the iPad or book first was determined randomly. Bedtime was 10 p.m. and the time to fall asleep was measured each evening. It was found that participants took an average of 10 minutes longer to fall asleep after reading on an iPad. The P-value for the test was 0.009.
Source: Anne-Marie Chang et al. “Evening Use of Light-Emitting eReaders Negatively Affects Sleep, Circarian Timing, and Next-Morning Alertness’ PNAS 2015 112(4) 1232-1277. doi:10.1073/pnas.1418490112
- a. What is the research objective?
- b. What is the response variable? It is quantitative or qualitative? Time to sleep; quantitative
- c. What is the treatment? e-Reader or book
- d. Is this a designed experiment or observational study? What type? Matched-pairs design
- e. The null hypothesis for this test would be that there is no difference in time to fall asleep with an e-Reader and printed book. The alternative is that there is a difference. Interpret the P-value.
Want to see the full answer?
Check out a sample textbook solutionChapter 10 Solutions
Fundamentals of Statistics, Books a la Carte Edition Plus MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)
- Algebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:CengageHolt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGALCollege Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage Learning