In a study of three nationally representative large-scale data sets from Ireland, the United States, and the United Kingdom, 17,247 teenagers between the ages of 12 to 15 were asked to keep a diary of their screen time and answer questions about how they felt or acted. The answers to these questions were then used to compute a psychological well-being score. Match each of the following descriptions with the term it describes. All teenagers in Ireland, the US, and the UK The percentage of all teenagers in the world that have high self esteem The way a particular teenager from the study felt or acted The 17,247 teenagers in this study Screen time The average screen time among teenagers in the study
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All teenagers in Ireland, the US, and the UK: This refers to the entire population of teenagers in these three countries. So, this description matches with "Population." Show more…
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In a study of three nationally representative large-scale datasets from Ireland, the United States, and the United Kingdom (n = 17,247), teenagers between the ages of 12 to 15 were asked to keep a diary of their screen time and answer questions about how they felt or acted. The answers to these questions were then used to compute a psychological well-being score. Additional data were collected and included in the analysis, such as each child's sex and age, and the mother's education, ethnicity, psychological distress, and employment. The study concluded that there is little clear-cut evidence that screen time decreases adolescent well-being. Can the results of the study be generalized to the population of Irish, USA, and UK teenagers? Why or why not? Can the results of the study be used to determine if screen time affects adolescent well-being? Why or why not?
Megan K.
Over a 17-year period researchers studied a sample of 707 individuals from a single community. They recorded the number of hours each individual spent watching television during adolescence and early adulthood. In later years, they recorded the number of aggressive acts by individuals in the study: Science magazine published the results in 2002 in an article titled "Television viewing and aggressive behavior during adolescence and adulthood" Which of the following variables could NOT confound the results of this study? Parental supervision and other aspects of family life Gender The amount of television the adolescents watch Poverty and neighborhood conditions
Adi S.
Adolescent Brains Are Different Researchers continue to find evidence that brains of adolescents behave quite differently than either brains of adults or brains of children. In particular, adolescents seem to hold on more strongly to fear associations than either children or adults, suggesting that frightening connections made during the teen years are particularly hard to unlearn. In one study, ${ }^{25}$ participants first learned to associate fear with a particular sound. In the second part of the study, participants heard the sound without the fear-causing mechanism, and their ability to "unlearn" the connection was measured. A physiological measure of fear was used, and larger numbers indicate less fear. We are estimating the difference in mean response between adults and teenagers. The mean response for adults in the study was 0.225 and the mean response for teenagers in the study was $0.059 .$ We are told that the standard error of the estimate is 0.091 . (a) Give notation for the quantity being estimated. (b) Give notation for the quantity that gives the best estimate, and give its value. (c) Give a $95 \%$ confidence interval for the quantity being estimated. (d) Is this an experiment or an observational study?
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