iGen Author Discusses Slower Development of Modern Kids Part I Multiple Choice Questions The video lists several ways in which teenagers now are different than teenagers in the past. Which of the following is not one of those ways? Teenagers now drink less. Teenagers now have more sex. Teenagers now get their driver's licenses later. Teenagers now have higher rates of suicide. Suppose a researcher obtains a random sample of teenagers in 2016 and collects information from each teenager concerning smartphone use, daily activities, and psychological well-being. The researcher intends to compare summary values from her sample to other published summary values from another similar sample collected and analyzed by other researchers in 2010. Which of the following variables would be summarized and compared using a proportion? the teenager's depression score (on, for example, the Beck Depression Inventory) the number of times per day the teenager goes to a social media site the amount of time the teenager spends on his/her smartphone daily whether the teenager's depression score indicates he or she is depressed Suppose 75% of the teenagers in the researcher's sample report owning a smartphone. Given only this information, which of the following is the most accurate statement concerning smartphone ownership among all teenagers in 2016. 25% of all teenagers in 2016 did not own a smartphone. Teenagers who own smartphones are more likely to be depressed. More teenagers own smartphones 2016 than in 2010. Probably more than half of the teenagers in 2016 owned smartphones.
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Step 1: Identify the ways in which teenagers now are different than teenagers in the past mentioned in the video: - Teenagers now drink less - Teenagers now get their driver's licenses later - Teenagers now have higher rates of suicide Show more…
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A sociologist was curious about how much smartphone access has changed for American teenagers. They obtained separate random samples of teenagers from 2017 and 2013. Here are their results: Has access to smartphone? 2017 2013 Yes 450 120 No 150 280 Total 600 400 They want to use these results to construct a 95% confidence interval to estimate the difference in the proportion of teens each year who had access to a smartphone (p2017 - p2013). Which of the following is the correct 95% confidence interval based on their data? a) (0.393, 0.507) b) (0.023, 0.168) c) (0.127, 0.449) d) (0.410, 0.523) Researchers want to study the effectiveness of a new medication to treat depression. In a randomized experiment, 71 out of 200 people taking the medication report symptoms of depression. Of the people receiving a placebo, 92 out of 200 report symptoms of depression. The researchers want to use these results to test if the medication is working any differently than the placebo. Let p1 be the true proportion of individuals like the ones in this study who take the new medication and report symptoms of depression, and p2 be the true proportion of individuals like the ones in this study who take a placebo and report symptoms of depression. Which of the following is an appropriate set of hypotheses for their significance test? a) H0: p1 = p2, Ha: p1 < p2 b) H0: p1 = p2, Ha: p1 > p2 c) H0: p1 = p2, Ha: p1 ≠ p2 d) H0: p1 ≠ p2, Ha: p1 = p2
Ajiboye T.
Exercise 3-8: Generation M The generation of children raised in the 1990s and 2000s has been dubbed Generation M because of the impact of media on their lives. The Kaiser Family Foundation conducted an extensive study to quantify how much time teenagers spend with various types of media. They gathered data from what they describe as a “nationally representative sample” of 2032 teenagers. Identify each of the following as a parameter (P) or a statistic (S): a. The proportion of all American teenagers who have televisions in their bedrooms P b. The proportion of these 2032 teenagers who have televisions in their bedrooms S c. The proportion of boys in this sample who have televisions in their bedrooms S d. The average number of hours per week the teenagers in this study spent reading S e. The average number of hours per week of recreational computer use among all American teenagers P f. The proportion in this study who rated their level of contentedness as high S g. The proportion who rated their contentedness as high among all American teenagers P h. The average amount of weekly media exposure among those surveyed who rate their level of contentedness as high S Exercise 3-10: Penny Thoughts On July 15, 2004, the Harris Poll released the results of a survey asking whether people favored or opposed abolishing the penny. Of a national sample of 2136 adults, 59% opposed abolishing the penny. For each of the following statements, decide whether it is True (T), or False (F). a. The population is the 2136 adults contacted by the Harris Poll. [ Select ] b. The sample is the 59% who oppose abolishing the penny. [ Select ] c. The variable is the 59% who oppose abolishing the penny. [ Select ] d. The observational units in this survey are adults. [ Select ] e. The parameter consists of all American adults. [ Select ] f. The statistic is the percentage (59%) of the 2136 adult Americans who oppose abolishing the penny. [ Select ]
Amman Z.
Exercise 3-7: Student Data Consider your class of students as a sample from the population of all students at UW-Oshkosh. For each of the seven following variables, indicate whether or not your class would likely constitute a representative sample from this population with regard to that variable. Answer N (for 'No) if there is a clear reason why the class differs from the overall UWO population; otherwise, answer PY (for 'Possibly Yes'). • Class Distribution (Percentage of FR, So, JR, SR) No • Hours slept last night Probably Yes • Number of siblings Probably Yes • Age No • Political viewpoint No • Gender Probably Yes • Time left until Graduation No Exercise 3-8: Generation M The generation of children raised in the 1990s and 2000s has been dubbed Generation M because of the impact of media on their lives. The Kaiser Family Foundation conducted an extensive study to quantify how much time teenagers spend with various types of media. They gathered data from what they describe as a “nationally representative sample” of 2032 teenagers. Identify each of the following as a parameter (P) or a statistic (S): a. The proportion of all American teenagers who have televisions in their bedrooms b. The proportion of these 2032 teenagers who have televisions in their bedrooms c. The proportion of boys in this sample who have televisions in their bedrooms d. The average number of hours per week the teenagers in this study spent reading e. The average number of hours per week of recreational computer use among all American teenagers f. The proportion in this study who rated their level of contentedness as high g. The proportion who rated their contentedness as high among all American teenagers h. The average amount of weekly media exposure among those surveyed who rate their level of contentedness as high
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