- guests having departed, he went to bed.. article?
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Losing sleep An article entitled “TV Before Bed May Rob Teens of Sleep” reported on a study published online in Pediatrics in January of 2013. The study found that students who watch TV before bedtime tend to go to sleep later than those who engaged in non screen sedentary activities before bed. Researchers contacted a nationally representative cross-sectional sample of teens in New Zealand, interviewing participants in person and following up with phone interviews, to look for a relationship between before-bed activities and the length of time before kids go to sleep. a) Is this an experiment? Explain why or why not. b) Researchers cautioned that “causality could not be inferred from their cross-sectional study.” Explain why this is the case. c) Comment on the title of the article in light of your answer to part b.
Sri K.
In a cover story, BusinessWeek published information about sleep habits of Americans (BusinessWeek, January 26,2004 ). The article noted that sleep deprivation causes a number of problems, including highway deaths. Fifty-one percent of adult drivers admit to driving while drowsy. A researcher hypothesized that this issue was an even bigger problem for night shift workers. a. Formulate the hypotheses that can be used to help determine whether more than $51 \%$ of the population of night shift workers admit to driving while drowsy. b. $\quad$ A sample of 400 night shift workers identified those who admitted to driving while drowsy. See the Drowsy file. What is the sample proportion? What is the $p$ -value? c. $\quad$ At $\alpha=.01,$ what is your conclusion?
A scientist who studies sleep has developed a new technique to help people sleep each night. He is conducting a study of 100 people and wants to determine if there is a significant difference in people’s amount of sleep before using the technique compared to after using the technique. Which of the following describes the scientist’s null and alternative hypotheses?
Gershon Kwame M.
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