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Revisar envio do teste: Atividade - Statistics 3
Estatística Avaliação e Certificado Acesse a atividade e o Certificado de Statistics 3
Revisar envio do teste: Atividade - Statistics 3 
Usuário MANOEL AMBROSIO MAGESTE DOS SANTOS
Curso Estatística
Teste Atividade - Statistics 3
Iniciado 13/06/20 13:00
Enviado 13/06/20 15:28
Status Completada
Resultado da tentativa 7 em 10 pontos 
Tempo decorrido 2 horas, 27 minutos
Resultados exibidos Respostas enviadas, Respostas corretas, Comentários
Pergunta 1
Resposta Selecionada: 
Resposta Correta: 
Fit the binomial model when appropriate, and use it to perform probability calculations.
"multiple choice" question: select the correct answer.
What are the mean and standard deviation of X, the number of females out of the 10
chosen who are binge drinkers?
μx=10(0.15) , σx=10(0.15)(0.85)
μx=10(0.15) , σx=10(0.15)(0.85)−−−−−−−−−−−−√
Pergunta 2
A patient with a failing heart is waiting for a heart transplant. If a suitable transplant is found, the patient’s
chances of survival are much higher than the patient’s chances of survival if a suitable transplant is not
found.
Let T be the event that a suitable Transplant is found.
Let S be the event that the patient Survives
The following probability tree summarizes the patient’s chances of finding a suitable transplant and survival.
Use the tree to answer the following questions:
Use Probability Trees as a tool to find probabilities
"multiple choice" question: select the correct answer.
Given that the patient survives, what is the probability that a suitable transplant was
found (what is P(T|S))? (Some answers were rounded).
Minha Área
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MANOEL AMBROSIO MAGESTE DOS SANTOS
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13/06/2020 Revisar envio do teste: Atividade - Statistics 3 – ...
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Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
.616
.616
This is correct.
P(T│S)=.30×.75.30×.75 + .70*.20=.225.365≈.616
Pergunta 3
Resposta Selecionada: 
Resposta Correta: 
This is correct. This is the only incorrect statement.
A 2015 CNN Money article provided the following information about the social class distribution of U.S.
adults.
Apply probability rules in order to find the likelihood of an event
"multiple choice" question: select the correct answer.
Four U.S. adults are selected at random. What is the probability that at least one of
them belongs to the Upper Class?
.794
1 – .794
Pergunta 4
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
A family eats out twice a month – once during the first week of the month and once during the third week of
the month, in one of the three local restaurants: R1, R2, or R3. Thus the outcome (R3, R2) denotes that on
a given month the family eats in R3 during the first week of the month and in R2 during the third week of
the month. It is possible for the family to eat at the same restaurant both on the first week and on the third
week of the month.
Find the probability of events in the case when all outcomes are equally likely.
"multiple choice" question: select the correct answer.
Assume that each time that the family goes out to eat they choose one of the three
restaurants at random, and again, let A be the event that on a given the family eats in
R2 exactly once. What is P(A)?
4/9
4/9
This is correct.
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Pergunta 5
Resposta Selecionada: 
Resposta Correta: 
Feedback da
resposta:
Based on the Journal of the American Medical Association, weights of all newborn babies in U.S. follow a
normal distribution with a mean of 3420 grams and standard deviation of 500 grams. The weights of 625
randomly selected newborns were recorded and it was found that the average and standard deviation in
this sample were 3450 grams and 490, respectively.
Skill: Distinguish between a parameter and a statistic and recognize the concept of sampling variability.
 "multiple choice" question: select the correct answer. 
Which of the following is a parameter?
500
500
This is correct. 500 is the population standard deviation and therefore a
parameter.
Pergunta 6
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
Understand how probability quantifies uncertainty and relate the probability of an event
to the likelihood of the event occurring.
"multiple choice" question: select the correct answer.
Which of the following represents the probability of an event that is more likely not to
occur than it is to occur, but would not be unusual for it to occur?
0.32
0.32
This is correct.
Pergunta 7
The probability table below summarizes the information that a large cable company provides about its
customers:
Where:
T is the event that a randomly chosen customer subscribes to TV service
I is the event that a randomly chosen customer subscribes to Internet service
Create a probability table to organize and summarize information and use it to find
probabilities
"multiple choice" question: select the correct answer.
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Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
What is the correct representation and probability of the event that a customer
subscribes only to TV service?
P(T and Not I) = .05
P(T and Not I) = .05
This is correct.
Pergunta 8
Resposta
Selecionada:
Resposta Correta:
Skill: Determine the sampling distribution of the sample proportion and the sample mean in a given
situation and apply it to determine likelihoods.
"multiple choice" question: select the correct answer.
It was reported that 30% of all credit card users in the U.S. pay their card card bill in full every month.A
random sample of size n=84 credit cards users is chosen. Which of the following is true regarding the effect
of the increased sample size (from 21 to 84) on the mean and standard deviation of sampling distribution of
pˆ?
The mean of the sampling distribution will stay the same, but the standard deviation
will decrease.
The mean of the sampling distribution will stay the same, but the standard deviation
will increase.
Pergunta 9
Resposta Selecionada: 
Resposta Correta: 
Feedback da resposta:
The probability table below summarizes the information that a large cable company provides about its
customers:
Where:
T is the event that a randomly chosen customer subscribes to TV service
I is the event that a randomly chosen customer subscribes to Internet service
Create a probability table to organize and summarize information and use it to find
probabilities
"multiple choice" question: select the correct answer.
In context, the fact that P(Not T and Not I) = 0 means that:
All the customers subscribe to at least one of the two services.
All the customers subscribe to at least one of the two services.This is correct.
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Sábado, 13 de Junho de 2020 15h29min52s BRT
Pergunta 10
Resposta Selecionada: 
Resposta Correta: 
Feedback da
resposta:
An epidemiological study reported the following information about two contagious diseases:
· There is 15% chance of contracting Disease I
· There is 20% chance of contracting Disease II
· There is 2% chance of contracting both diseases
Let A be the event that a randomly chosen person contracts Disease I
Let B be the event that a randomly chosen person contracts Disease II
Apply probability rules in order to find the likelihood of an event
"multiple choice" question: select the correct answer.
What is P(A or B) equal to?
.33
.33
This is correct. By the General Addition Rule:P(A or B)=P(A) + P(B) –
P(A and B) = .15 + .20 – .02 = .33
← OK
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