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ESTATÍSTICA 2 Pergunta 1 1 em 1 pontos The Dean of Students at a large university wants to know what proportion of a freshmen students are happy with the academic advising the university provides. The Dean obtains a list of all freshman students who visited the Academic Advising Center during the past month and selects and collects data from a random sample of 100 students from that list. Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. Which of the following sampling methods will likely produce a sample that is biased and not representative of the population? Resposta Selecionada: Volunteer sampling Resposta Correta: Volunteer sampling Feedback da resposta: This is correct. Volunteer sampling is the only method on this is list where a sample is not chosen at random. Pergunta 2 1 em 1 pontos Skills: Identify the design and other features of a study Understand how the design of a study impacts the type of conclusions that can be drawn "multiple choice" question: select the correct answer. A study explored the relationship between drinking diet soda and the risk of stroke. The researchers followed a group of individuals who are ‘diet soda drinkers’ and a group of individuals who are not diet soda drinkers and found a higher rate of stroke among those who are diet soda drinkers. After the researchers collected more data, they discovered that the weight of the individuals was significantly higher, on average, in the diet soda drinkers group. Which of the following is true? Resposta Selecionada: Weight is a lurking variable Resposta Correta: Weight is a lurking variable Pergunta 3 1 em 1 pontos The Dean of Students at a large university wants to know what proportion of a freshmen students are happy with the academic advising the university provides. The Dean obtains a list of all freshman students who visited the Academic Advising Center during the past month and selects and collects data from a random sample of 100 students from that list. Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. In this case, the sampling frame is: Resposta Selecionada: All the Freshman students who visited the Academic Advising Center during the past month Resposta Correta: All the Freshman students who visited the Academic Advising Center during the past month Feedback da resposta: This is correct. The sampling frame is the list from which the sample was chosen. In this case is all the freshmen who visited the Academic Advising Center during the past month. Pergunta 4 1 em 1 pontos Skills: Identify the design and other features of a study Determine how the features of a survey impacts the quality of the collected data Understand how the design of a study impacts the type of conclusions that can be drawn "Fill in the blank" question: select the correct answer. A study was conducted to explore the effect of handwriting style (cursive or block letters) on the score of an SAT essay. An identical essay was shown to a random sample of 120 SAT essay graders. The graders were randomly assigned to grade a cursive version of the essay or a version with printed block letters. The average score of the essay with the cursive style was higher than the average score of the essay with the printed block letters. Complete the the following sentence: This is and a control group. Respostas Selecionadas: does not have experiment blind Respostas Corretas: does not have experiment blind Pergunta 5 1 em 1 pontos Unit: Producing Data Module: Designing Studies A weight loss program provides three follow-up methods to choose from for individuals who went through the program and reached their desired weight: monthly in-person meeting, monthly on-line meeting, and monthly newsletter by mail. In order to assess the effectiveness of the three follow-up methods, the program selects a random sample of 291 individuals who went through the program and reached their desired weight and classifies them according to the follow-up method that they sign-up for. A year later the study finds that 30% of those who chose to sign up for the in-person follow-up method regained more than 5 pounds, 50% of those who chose to sign-up for the online method regained more than 5 pounds and 70% of those who chose to sign-up for the newsletter method regained more than 5 pounds. Skill: Identify the design and other features of a study "multiple choice" question: select the correct answer. Which of the following is the correct design of this study? Resposta Selecionada: An observational study Resposta Correta: An observational study Feedback da resposta: This is correct. Pergunta 6 0 em 1 pontos The Dean of Students at a large university wants to know what proportion of a freshmen students are happy with the academic advising the university provides. The Dean obtains a list of all freshman students who visited the Academic Advising Center during the past month and selects and collects data from a random sample of 100 students from that list. Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. The HR department chooses a random sample of 5 employees from each of the 120 bank’s branches and collects data from the 600 selected employees. The sampling method in this case is: Resposta Selecionada: Multistage sampling Resposta Correta: Stratified sampling Pergunta 7 0 em 1 pontos The Dean of Students at a large university wants to know what proportion of a freshmen students are happy with the academic advising the university provides. The Dean obtains a list of all freshman students who visited the Academic Advising Center during the past month and selects and collects data from a random sample of 100 students from that list. Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. In this case the population of interest is: Resposta Selecionada: All the Freshman students who visited the Academic Advising Center during the past month Resposta Correta: All the Freshman students at the university Pergunta 8 1 em 1 pontos Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. At random, the HR Department selects 20 of the 120 bank’s branches, and from each of the selected branches selects a random sample of 15 male and 15 female employees. The sampling method in this case is: Resposta Selecionada: Multistage sampling Resposta Correta: Multistage sampling Feedback da resposta: This is correct. This is an example of multistage sampling (first stage: cluster sampling, second stage: stratified sampling). Pergunta 9 1 em 1 pontos Skill: Identify the sampling method and its potential limitations. "multiple choice" question: select the correct answer. The HR department chooses 10 of the 120 bank’s branches at random and collects data from all the employees who work at these selected branches. The sampling method in this case is: Resposta Selecionada: Cluster sampling Resposta Correta: Cluster sampling Pergunta 10 1 em 1 pontos Skill: Determine how the features of a survey impacts the quality of the collected data "multiple choice" question: select thecorrect answer. Which of the following would be the best question to include in a poll in order to assess the opinions of U.S. adults about legalizing marijuana? Resposta Selecionada: Which of the following best describes your view about legalizing the use of marijuana? Strongly favor legalizing the use of marijuana Favor legalizing the use of marijuana Oppose legalizing the use of marijuana Strongly oppose legalizing the use of marijuana Not sure Resposta Correta: Which of the following best describes your view about legalizing the use of marijuana? Strongly favor legalizing the use of marijuana Favor legalizing the use of marijuana Oppose legalizing the use of marijuana Strongly oppose legalizing the use of marijuana Not sure
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