estatistica 2(01)

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Pergunta 1
0 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
	Respostas Corretas:
	 
does not have
	
	 
experiment
	
	 
blind
	
	
	
Pergunta 2
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. Which of the following sampling methods will likely produce a sample that is biased and not representative of the population?
	
	
	
	
		Resposta Selecionada:
	 
Stratified sampling
	Resposta Correta:
	 
Volunteer sampling
	
	
	
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
	
	
	
	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, all the Freshman students who are happy with the advising that the university provides is the:
	
	
	
	
		Resposta Selecionada:
	 
None of the above
	Resposta Correta:
	 
None of the above
	
	
	
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: Understand how the design of a study impacts the type of conclusions that can be drawn
"multiple choice" question: select the correct answer. In this case, can we conclude that any association that is found in the sample was due to causation? In other words, can we conclude that the follow-up method is the cause for whether or not the sampled individuals regained more than five pounds within a year?
	
	
	
	
		Resposta Selecionada:
	 
No, since the individuals chose themselves which follow-up method to sign-up for.
	Resposta Correta:
	 
No, since the individuals chose themselves which follow-up method to sign-up for.
	
	
	
Pergunta 6
0 em 1 pontos
	
	
	
	Skill: Identify the sampling method and its potential limitations.
"multiple choice" question: select the correct answer. The HR department sends an email to all the bank employees with a link to job satisfaction survey and collects data from the sample of 400 employees who chose to complete the survey. The sampling method in this case is:
	
	
	
	
		Resposta Selecionada:
	 
Multistage sampling
	Resposta Correta:
	 
Volunteer 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. Which of the following is true regarding the sample of students chosen?
	
	
	
	
		Resposta Selecionada:
	 
Since the sample is random, it is representative of the population of interest
	Resposta Correta:
	 
Even though the sample is random, it is not representative of the population of interest
	
	
	
Pergunta 8
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 best describes the design of this study?
	
	
	
	
		Resposta Selecionada:
	 
A blind experiment
	Resposta Correta:
	 
A blind experiment
	Feedback da resposta:
	This is correct.
	
	
	
Pergunta 9
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 selectsand 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 at the university
	Resposta Correta:
	 
All the Freshman students at the university
	
	
	
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 the correct 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