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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 GUILHERME LEDO FARIA BRANDAO
Curso Estatística
Teste Atividade - Statistics 3
Iniciado 22/11/19 23:23
Enviado 22/11/19 23:24
Status Completada
Resultado da tentativa 3 em 10 pontos 
Tempo decorrido 0 minuto
Resultados exibidos Respostas enviadas, Respostas corretas, Comentários
Pergunta 1
Resposta Selecionada: 
Resposta Correta: 
An epidemiological study investigated the prevalence of two
contagious diseases ( Disease 1 and Disease 2) in the U.S.
Let A be the event that an individual contracts Disease 1
Let B be the event that an individual contracts Disease 2
Understand the reasoning behind the concept of conditional
probability, calculate conditional probabilities and interpret them.
"multiple choice" question: select the correct answer.
The study reported the following:
· There is 15% chance of contracting Disease 1
· There is 10% chance of contracting Disease 2
· There is 3% chance of contracting both Disease 1 and Disease 2
Which of the following is true regarding P(B|A)?
P(B|A) = .015
P(B|A) = .20
Pergunta 2
Airlines sometimes overbook flights. Suppose that for a plane with 111
seats an airline takes 115 reservations. Let the random variable X be
the number of people who actually show up (out of the 115 who
bought a ticket). From past experience the probability distribution of X
is given in the following table:
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Resposta Selecionada: 
Resposta Correta: 
Feedback
da
resposta:
x 108 109 110 111 112 113 114 115
P(X=x) 0.14 0.16 0.24 0.20 0.13 0.06 0.05 0.02
0.74
0.74
This is correct. P(No more than 111 passenger show up)
= P(X ≤ 111) = 0.14 + 0.16 + 0.24 + .20 = 0.74
Pergunta 3
Resposta Selecionada: 
Resposta Correta: 
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.
 
Apply probability rules in order to find the likelihood of an event
"multiple choice" question: select the correct answer.
Let event A and event B be two disjoint events. Which of the following
is incorrect?
 
P(A and B)=0
Event A is the complement of Event B.
Pergunta 4
This is correct. Since the events “belongs to Middle Class” and
“belongs to Upper Class” are disjoint, P(Middle or Upper)=P(Middle)+
P(Upper)=.50+.21=.71
 
Apply probability rules in order to find the likelihood of an event
"Fill in the blank" question: select the correct answer.
Two U.S. adults are chosen at random.Let A be the event that the first
adult belongs to the Middle ClassLet B be the event that the second
adult belongs to the Lower class.
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Resposta Selecionada: 
Resposta Correta: 
Complete the following sentences:
Events A and B are
.Events A and B are
 
Not disjoint
Disjoint
Pergunta 5
Resposta Selecionada: 
Resposta Correta: 
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.
What is the probability that a randomly chosen customer subscribes
to exactly one of the two services?
 
.05
.15
Pergunta 6
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.
Determine the sample space of a random experiment and identify
which outcomes are included in a particular event
"multiple choice" question: select the correct answer.
Let A be the event that on a given month the family eats in R2 exactly
once. What are the possible outcomes for this event?
 
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Resposta
Selecionada:
Resposta Correta: 
{ (R2, R2) (R1, R2) (R2, R1) (R2, R3) (R3, R2) }
{ (R1, R2) (R2, R1) (R2, R3) (R3, R2) }
Pergunta 7
Resposta Selecionada: 
Resposta Correta: 
Airlines sometimes overbook flights. Suppose that for a plane with 111 seats an airline
takes 115 reservations. Let the random variable X be the number of people who
actually show up (out of the 115 who bought a ticket). From past experience the
probability distribution of X is given in the following table: 
x 108 109 110 111 112 113 114 115 
P(X=x) 0.14 0.16 0.24 0.20 0.13 0.06 0.05 0.02
 
 
Find the probability distribution function of a discrete random variable
and use it to find probabilities
"multiple choice" question: select the correct answer.
Given that an hour before the flight 109 passengers have already
showed up to the flight, what is the probability that a total of 111 or
less passengers will eventually show up to the flight? (Some answers
are rounded to 2 decimal places).
 
0.74
0.70
Pergunta 8
Resposta Selecionada: 
Resposta Correta: 
Fit the binomial model when appropriate, and use it to perform
probability calculations.
"multiple choice" question: select the correct answer.
The price of a European tour includes stopovers at five cities to be
selected from 15 cities. In how many ways can a traveler plan such a
tour if the traveler can only choose the five cities (the order is
determined by the travel company).
 
15
3,003
Pergunta 9
This is correct. This is the only incorrect statement. 
A 2015 CNN Money article provided the following information about the social class
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Resposta Selecionada: 
Resposta Correta: 
Feedback da
resposta:
distribution of U.S. adults.
 
Apply probability rules in order to find the likelihood of an event
"multiple choice" question: select the correct answer.
Two U.S. adults are chosen at random.
Which of the following is the probability that first chosen is Middle
Class and the second chosen is Lower Class? In other words, which
of the following is P(A and B), where events A and B are as defined in
Question #8..50 * .29
.50 * .29
This is correct. P(A and B) = [A, B independent] =
P(A) * P(B) = .50 * .29
Pergunta 10
Resposta
Selecionada:
Resposta
Correta:
Feedback da resposta:
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 increase.
The mean of the sampling distribution will stay the same, but the
standard deviation will increase.
This is correct.
← OK
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