Atividade - Statistics II

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• Pergunta 1 
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 2 
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 3 
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. When designing and writing questions for 
a survey, which of the following are issues that you need to pay attention to? 
 
Resposta Selecionada: 
All of the above 
Resposta Correta: 
All of the above 
Feedback da resposta: This is correct. 
 
 
• 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: 
experiment 
 
 
does not have 
 
 
blind 
Respostas Corretas: 
experiment 
 
does not have 
 
blind 
 
 
• Pergunta 5 
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 is true regarding 
the sample of students chosen? 
 
Resposta 
Selecionada: 
 
Even though the sample is random, it is not representative of the 
population of interest 
Resposta Correta: 
Even though the sample is random, it is not representative of the 
population of interest 
 
 
• Pergunta 6 
0 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: 
 
Yes, since the individuals were randomly assigned to one of the the three 
follow-up methods 
Resposta Correta: 
No, since the individuals chose themselves which follow-up method to 
sign-up for. 
 
 
• Pergunta 7 
1 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: 
Volunteer sampling 
Resposta Correta: 
Volunteer sampling 
 
 
• Pergunta 8 
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. 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: 
Stratified sampling 
Resposta Correta: 
Stratified sampling 
 
 
• Pergunta 9 
0 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: 
An observational study 
Resposta Correta: 
A blind experiment 
 
 
• Pergunta10 
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.