Atividade - Statistics 2 - Anhembi Morumbi

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Curso Estatística
Teste Atividade - Statistics 2
Iniciado 04/06/20 09:19
Enviado 04/06/20 09:26
Status Completada
Resultado da tentativa 9 em 10 pontos 
Tempo decorrido 6 minutos
Resultados exibidos Respostas enviadas, Respostas corretas, Comentários
Pergunta 1
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
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?
A blind experiment
A blind experiment
This is correct.
Pergunta 2
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
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?
All of the above
All of the above
This is correct.
Pergunta 3
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
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Resposta
Selecionada:
Resposta
Correta:
regained more than 5 pounds and 70% of those who chose to sign-up for the newsletter method
regained more than 5 pounds.
'Smart drinks' are beverages containing vitamins and amino acids, which are marketed as helpful to
mental performance. To investigate the claimed effect of a particular 'smart drink' for the general adult
population, a health researcher obtains 250 adults who volunteer for a beverage-and-memory study.
Each of the subjects is then randomly assigned to get one beverage from among two possible: Either
the 'smart drink' or else a ‘fake smart drink’ – a drink that looks and tastes the same as the 'smart
drink', but does not contain any vitamins or amino acids). The subjects did not know which of the two
beverages they were assigned to drink. After drinking, each subject is told to memorize a list of words;
the subjects are then tested on how many words they can correctly recall. The number of correctly-
recalled words is recorded for each subject.
Skill: Understand how the design of a study impacts the type of conclusions that can be drawn
"multiple choice" question: select the correct answer. If the number of words recalled is really
significantly higher on average in the 'smart drink' group, can we reasonably conclude that the
improved recall of those in the 'smart drink' group was actually caused by the smart drink?
Yes, since the individuals were randomly assigned to drink either the ‘smart drink’
or the ‘fake smart drink’.
Yes, since the individuals were randomly assigned to drink either the ‘smart drink’
or the ‘fake smart drink’.
Pergunta 4
Resposta Selecionada: 
Resposta Correta: 
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:
Convenience Sampling
Multistage sampling
Pergunta 5
Resposta
Selecionada:
Resposta Correta:
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?
No, since the individuals chose themselves which follow-up method to sign-up
for.
No, since the individuals chose themselves which follow-up method to sign-up
for.
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Pergunta 6
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
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?
An observational study
An observational study
This is correct.
Pergunta 7
Resposta Selecionada: 
Resposta Correta: 
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:
All the Freshman students at the university
All the Freshman students at the university
Pergunta 8
RespostaSelecionada:
Resposta Correta:
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?
Even though the sample is random, it is not representative of the population of
interest
Even though the sample is random, it is not representative of the population of
interest
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Pergunta 9
Resposta Selecionada: 
Resposta Correta: 
Feedback da
resposta:
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?
Volunteer sampling
Volunteer sampling
This is correct. Volunteer sampling is the only method on this is list where a
sample is not chosen at random.
Pergunta 10
Resposta
Selecionada:
Resposta Correta:
Feedback
da
resposta:
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:
All the Freshman students who visited the Academic Advising Center during the
past month
All the Freshman students who visited the Academic Advising Center during the
past month
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.
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