Magna Concursos

Foram encontradas 395 questões.

350672 Ano: 2011
Disciplina: Estatística
Banca: ANPEC
Orgão: ANPEC
Provas:
Suponha que as notas de matemática dos alunos em um exame nacional aplicado a todas as escolas do ensino médio sejam normalmente distribuídas com média 500 e variância 1000. Um cursinho faz uma propaganda afirmando que pode melhorar as notas dos alunos em 30 pontos caso eles frequentem um curso noturno que resolve as questões dos exames anteriores. O órgão de defesa do consumidor quer testar se este curso noturno é de fato efetivo. O estatístico deste órgão de defesa do consumidor formula o seguinte problema: Seja M a nota que o aluno i obtém após frequentar o curso noturno, suponha que M é normalmente distribuído com média desconhecida !$ \mu_M !$ e variância igual a 1000. O teste de hipótese que ele gostaria de fazer é o seguinte: !$ H_0:\mu_M=500 !$ vs !$ H_1:\mu_M > 500 !$.
[Para a resolução desta questão talvez lhe seja útil saber que se Z tem distribuição normal padrão, então Pr(|Z|>1,645)=0,10 e Pr(|Z|>1,96)=0,05.]
Com base nos dados do problema, julgue a seguinte afirmativa:
Item 3 - Mantendo o nível de significância fixo, para diminuir o poder do teste, o estatístico pode aumentar o tamanho da amostra.
 

Provas

Questão presente nas seguintes provas
350652 Ano: 2011
Disciplina: Economia
Banca: ANPEC
Orgão: ANPEC
Provas:
Considere uma versão modificada do modelo de Mundell-Fleming para uma pequena economia aberta com perfeita mobilidade de capitais e preços fixos. As modificações assumem que: (i) as exportações líquidas não são afetadas pela renda doméstica, mas dependem positivamente da renda externa e da taxa de câmbio nominal; (ii) o nível de preço doméstico (P) é uma média ponderada dos preços de bens importados e dos preços de bens produzidos domesticamente, isto é:
!$ P=\lambda\overline{P}^d + (1-\lambda)\overline{P}^*\epsilon !$
em que !$ \overline{P}^d !$ é o preço (em moeda doméstica) dos bens produzidos domesticamente, !$ \overline{P}^* !$ é o preço (em moeda externa) dos bens importados, !$ \epsilon !$ é a taxa de câmbio nominal (unidades de moeda doméstica por uma unidade de moeda externa e !$ \lambda !$ é um parâmetro tal que !$ 0 < \lambda \le 1 !$.
Com base nessas informações, julgue a seguinte afirmativa:
Item 4 - Sob câmbio flutuante, a redução nas exportações líquidas provocada por um aumento do gasto do governo é maior sob !$ \lambda = 1 !$ do que sob !$ \lambda < 1 !$.
 

Provas

Questão presente nas seguintes provas
350518 Ano: 2011
Disciplina: Economia
Banca: ANPEC
Orgão: ANPEC
Provas:
Sobre o papel do Estado na economia brasileira pode-se afirmar:
Item 1 - o Plano de Estabilização Monetária, proposto pelo ministro Lucas Lopes em 1958, previa um tratamento mais gradual no combate à inflação do que o tratamento de choque sugerido pelo Fundo Monetário Internacional (FMI).
 

Provas

Questão presente nas seguintes provas
350496 Ano: 2011
Disciplina: Matemática
Banca: ANPEC
Orgão: ANPEC
Provas:
Julgue a afirmativa:
Seja !$ f:R^* \rightarrow R\ !$, tal que !$ x^2f(x)=x~^2+7x+3 !$. Julgue a afirmativa:
Item 0 - !$ f !$ tem uma assíntota horizontal e uma assíntota vertical.
 

Provas

Questão presente nas seguintes provas
350478 Ano: 2011
Disciplina: Economia
Banca: ANPEC
Orgão: ANPEC
Provas:
No que se refere à teoria da produção, avalie a validade das seguintes afirmações:
Item 2 - Se a função de produção de uma firma é dada por F(L,K) = L !$ \sqrt{K} !$ e os mercados de fatores são competitivos, então a mesma opera com custos marginais decrescentes.
 

Provas

Questão presente nas seguintes provas
350369 Ano: 2011
Disciplina: Estatística
Banca: ANPEC
Orgão: ANPEC
Provas:
É correta a afirmativa:
Item 2 - Suponha que !$ X_1, X_2, ..., X_n !$ sejam variáveis aleatórias independentes e identicamente distribuídas e que !$ X_i \sim N(0,1), \forall i !$. Então, se definirmos !$ Y_i=X^2_i, P(|Y_i-1| > 2) \le 0,5 !$.
 

Provas

Questão presente nas seguintes provas
350368 Ano: 2011
Disciplina: Economia
Banca: ANPEC
Orgão: ANPEC
Provas:
No que se refere ao equilíbrio de mercados competitivos:
Item 0 - Em um mercado competitivo que opera com “custos crescentes” no longo prazo e livre entrada/saída, o preço de equilíbrio é independente da demanda do mercado.
 

Provas

Questão presente nas seguintes provas
350081 Ano: 2011
Disciplina: Estatística
Banca: ANPEC
Orgão: ANPEC
Provas:
É correta a afirmativa:
Item 4 - Suponha que !$ X_1, X_2, ..., X_n !$ sejam variáveis aleatórias independentes e identicamente distribuídas e que !$ X_i \sim N(\mu, \sigma^2), \forall_i !$. Então, se definirmos !$ \overline{X}=\sum^n_{i=1}X_i/n !$ e !$ \hat{\sigma}^2=\sum(X_i-\overline{X})^2/n, \hat{\sigma}^2 !$ será um estimador eficiente de !$ \sigma^2 !$.
 

Provas

Questão presente nas seguintes provas
350074 Ano: 2011
Disciplina: Inglês (Língua Inglesa)
Banca: ANPEC
Orgão: ANPEC
Provas:

Based on your interpretation of the texts that follow, determine if each statement is true or false.

Text 1

Excerpts from:

Earthquake preparations

The curse of complacency

Americans are neither shaken nor stirred

Apr 7th 2011 | LOS ANGELES | from the print edition

SOONER or later, America will suffer an earthquake as devastating as the one that has wreaked havoc on northern Japan. It could happen next week, next year or next century; it has happened on numerous occasions in the past, and will happen again. The best that can be done is to prepare for the inevitable, adopting measures that will help emergency teams rescue the victims and allow the recovery to proceed as rapidly as possible. But the chaos that ensued in the aftermath of Hurricane Katrina shows how unprepared America can be for disasters.

Earthquakes about as powerful as the magnitude 9.0 quake that shattered the coastal towns of northern Japan before drowning them with a 30ft tsunami have struck along the Oregon coast at least seven times during the past 3,500 years. The last time was on January 26th 1700. The precise date is known thanks to records kept by Japanese officials, who witnessed the devastation caused by the subsequent tsunami when it inundated their shores.

Dia6America’snext mega-disaster is likely to be a smaller earthquake, but one much closer to a major conurbation than has occurred of late. That could happen almost anywhere—from Alaska and California in the west to Massachusetts, Missouri and South Carolina to the east. All have suffered considerable death tolls and damage as a result of large earthquakes in the past.,

(...)

Geologists in America fear that the lack of serious shaking in recent times has lulled those living in seismically active parts of the country intobelieving that their local building codes and disaster preparations are adequate. A computer simulation, called “ShakeOut”, undertaken by the United States Geological Survey in 2008—involving over 5,000 emergency responders and 5.5m citizens—indicated that a magnitude 7.8 earthquake unleashed on the lower end of the San Andreas Fault, some 40 miles east of Los Angeles, would cause 1,800 deaths, $113 billion in damage and nearly $70 billion in business interruption.

Partly in response to ShakeOut, the National Earthquake Hazards Reduction Programme (set up by Congress in 1977 to mitigate the effects of earthquakes) commissioned a body of scientists in 2008 to draw up a 20-year action plan for reducing the hazard of earthquakes in America. The National Research Council (NRC), which was charged with developing the plan, reported last week on the 18 tasks it reckons are crucial if the country’s earthquake resilience is to be improved. Implementing the plan is expected to cost $6.8 billion over 20 years. That seems cheap. According to the California Emergency Management Agency, every dollar spent on preparation saves four dollars on reconstruction after a disaster.

One of the NRC’s most important (and certainly most expensive) recommendations is a national earthquake warning system like the one Japan installed in 2007. Thanks to its network of 1,000 seismic stations around the country, Japanese authorities had nearly a minute to halt bullet trains in northern Japan (none was derailed) and warn local employers to stop lifts and switch off dangerous machinery. The seismographs detect the Dia7burst of “P-waves” emitted by an earthquake that travel at twice the speed of the more destructive “S-waves”, giving valuable seconds of warning depending on the distance from the epicentre.

But seismologists fear a national earthquake warning system is unlikely to be built in America because of complacency and the spending squeeze. Finding just the $50m needed to complete California’s pilot network is proving hard enough—and Californians need no reminding how valuable such a system would be. Unlike the wary Japanese, when it comes to earthquake mitigation the majority of Americans remain unshaken and unstirred.

from the print edition | United States

According to the text:

Item 0 - Geologists in America think that people living in seismically activeparts of the country are aware that their disaster preparations should be improved;

 

Provas

Questão presente nas seguintes provas
350050 Ano: 2011
Disciplina: Inglês (Língua Inglesa)
Banca: ANPEC
Orgão: ANPEC
Provas:
Based on your interpretation of the texts that follow, determine if each statement is true or false.
Text 1
Excerpts from:
Earthquake preparations
The curse of complacency
Americans are neither shaken nor stirred
Apr 7th 2011 | LOS ANGELES | from the print edition
SOONER or later, America will suffer an earthquake as devastating as the one that has wreaked havoc on northern Japan. It could happen next week, next year or next century; it has happened on numerous occasions in the past, and will happen again. The best that can be done is to prepare for the inevitable, adopting measures that will help emergency teams rescue the victims and allow the recovery to proceed as rapidly as possible. But the chaos that ensued in the aftermath of Hurricane Katrina shows how unprepared America can be for disasters.
Earthquakes about as powerful as the magnitude 9.0 quake that shattered the coastal towns of northern Japan before drowning them with a 30ft tsunami have struck along the Oregon coast at least seven times during the past 3,500 years. The last time was on January 26th 1700. The precise date is known thanks to records kept by Japanese officials, who witnessed the devastation caused by the subsequent tsunami when it inundated their shores.
Dia6America’snext mega-disaster is likely to be a smaller earthquake, but one much closer to a major conurbation than has occurred of late. That could happen almost anywhere—from Alaska and California in the west to Massachusetts, Missouri and South Carolina to the east. All have suffered considerable death tolls and damage as a result of large earthquakes in the past.,
(...)
Geologists in America fear that the lack of serious shaking in recent times has lulled those living in seismically active parts of the country intobelieving that their local building codes and disaster preparations are adequate. A computer simulation, called “ShakeOut”, undertaken by the United States Geological Survey in 2008—involving over 5,000 emergency responders and 5.5m citizens—indicated that a magnitude 7.8 earthquake unleashed on the lower end of the San Andreas Fault, some 40 miles east of Los Angeles, would cause 1,800 deaths, $113 billion in damage and nearly $70 billion in business interruption.
Partly in response to ShakeOut, the National Earthquake Hazards Reduction Programme (set up by Congress in 1977 to mitigate the effects of earthquakes) commissioned a body of scientists in 2008 to draw up a 20-year action plan for reducing the hazard of earthquakes in America. The National Research Council (NRC), which was charged with developing the plan, reported last week on the 18 tasks it reckons are crucial if the country’s earthquake resilience is to be improved. Implementing the plan is expected to cost $6.8 billion over 20 years. That seems cheap. According to the California Emergency Management Agency, every dollar spent on preparation saves four dollars on reconstruction after a disaster.
One of the NRC’s most important (and certainly most expensive) recommendations is a national earthquake warning system like the one Japan installed in 2007. Thanks to its network of 1,000 seismic stations around the country, Japanese authorities had nearly a minute to halt bullet trains in northern Japan (none was derailed) and warn local employers to stop lifts and switch off dangerous machinery. The seismographs detect the Dia7burst of “P-waves” emitted by an earthquake that travel at twice the speed of the more destructive “S-waves”, giving valuable seconds of warning depending on the distance from the epicentre.
But seismologists fear a national earthquake warning system is unlikely to be built in America because of complacency and the spending squeeze. Finding just the $50m needed to complete California’s pilot network is proving hard enough—and Californians need no reminding how valuable such a system would be. Unlike the wary Japanese, when it comes to earthquake mitigation the majority of Americans remain unshaken and unstirred.
from the print edition | United States
[We can infer from the text that:
Item 4 - Hurricane Katrina is a good example of how effectively America is able to deal with disasters.
 

Provas

Questão presente nas seguintes provas