Foram encontradas 90 questões.
O datawarehouse requer a definição e a implementação de procedimentos que efetuem a
Provas
A Cia. X presta serviço de manutenção preventiva nos computadores que vende. Em 18 chamadas para realização de serviços de manutenção foram observados os pares (xi , yi) onde xi representa o número de máquinas examinadas na chamada e yi o tempo gasto, em horas, na visita de inspeção. A tais observações ajusta-se o modelo linear E( yi ) = 
xi,com o uso de mínimos quadrados ordinários, sob a hipótese de erros com média zero, homoscedásticos, não correlacionados e com os xi fixos (determinísticos). Foram obtidas as seguintes estatísticas para o ajuste: 
. As constantes a e b são as esti-mativas de mínimos quadrados de , respectivamente. Assinale a opção correspondente à estimativa não-viezada da variância residual.
Provas
- Estatística InferencialEstimadoresDistribuição Amostral dos EstimadoresDistribuição Amostral da MédiaFator de Correção para População Finita
Uma empresa grande de processamento de dados leva a efeito uma pesquisa de opinião sobre o nível de satisfação de seus empregados com os respectivos empregos. Neste contexto 100 empregados, de uma população infinita, sob objetivos práticos, são selecionados ao acaso e questionados. Destes, 50 mostraram-se satisfeitos ou muito satisfeitos com seus empregos. Assinale a opção que caracteriza o intervalo com coeficiente de confiança de 95%, simétrico, para a proporção populacional desconhecida de empregados satisfeitos ou muito satisfeitos com seu emprego. (Use em seus cálculos o Teorema Central do Limite e a tabela da distribuição normal padrão dada na Questão 23, aproximando o valor encontrado na tabela para o inteiro imediatamente superior)
Provas
Suponha que o tempo que a Receita Federal leva no processo de devolução do imposto pago a mais tenha distribuição normal com média de 12 semanas e desvio-padrão de 3 semanas. As-sinale a opção que estima a proporção de contribuintes que recebem a devolução em no máximo 6 semanas. A tabela abaixo dá os valo-res de P{0<X<Z} P{0<X<1,56}="0,4406.
Provas
Um aspecto importante do serviço de manutenção de programas numa empresa tem a ver com a velocidade (presteza) com que uma chamada de serviço (de manutenção) é atendida. Historicamente, numa determinada empresa, observa-se que as chances são de 50% de que uma chamada seja atendida num período inferior a 1 hora. Se 5 chamadas de manutenção são reali-zadas nessa empresa, assinale a opção que dá a probabilidade de que pelo menos 3 chamadas sejam atendidas em menos de 1 hora.
Provas
O gerente de marketing de uma fábrica de software planeja colocar no mercado um novo programa de análise de dados. Historicamente, 40% dos programas novos lançados pela fábrica são bem sucedidos. Antes do lançamento no mercado a fábrica tem por norma realizar uma pesquisa de mercado que resulta num relatório com uma conclusão favorável ou desfavorável ao novo produto. No passado, 80% dos programas bem sucedidos receberam relatórios favoráveis e 30% dos programas mal sucedidos também receberam relatórios favoráveis. O novo programa de análise de dados que a firma pretende lançar no mercado recebeu relatório favorável. Assinale a opção que corresponde à probabilidade de que seja bem sucedido.
Provas
Read the text below in order to answer questions 17 to 20.
Software
A substantial proportion of information can be digitized. It seems likely that soon, for example, any type of information that can be perceived, i.e. seen, heard, felt, smelt or tasted, will be reducible to a collection of bits. Once in digital form, the information in question can be stored, processed and displayed by a computer. Furthermore, it can readily and rapidly be transmitted from one computer to any other computer regardless of distance, political frontiers, and physical obstacles. From a digital point of view, there is absolutely no distinction between text, sounds, graphics, photographs, music, animations, videos and…software. To include software in our list, however, may seem rather odd. Why this is so? Computer programs are, after all, only digitized information like the other examples. However, there is one vital difference between software and the rest. While text, sounds, graphics, as well as the other examples given above, are generally passive in nature, software, by contrast, is essentially active. It is information with attitude! As Hart reminds us, "Computer programs are not only texts: they also behave". Software is both form and substance, both symbolic and functional, it both "is" and "does". For this reason, software is conceptually very challenging.
Provas
Read the text below in order to answer questions 17 to 20.
Software
A substantial proportion of information can be digitized. It seems likely that soon, for example, any type of information that can be perceived, i.e. seen, heard, felt, smelt or tasted, will be reducible to a collection of bits. Once in digital form, the information in question can be stored, processed and displayed by a computer. Furthermore, it can readily and rapidly be transmitted from one computer to any other computer regardless of distance, political frontiers, and physical obstacles. From a digital point of view, there is absolutely no distinction between text, sounds, graphics, photographs, music, animations, videos and…software. To include software in our list, however, may seem rather odd. Why this is so? Computer programs are, after all, only digitized information like the other examples. However, there is one vital difference between software and the rest. While text, sounds, graphics, as well as the other examples given above, are generally passive in nature, software, by contrast, is essentially active. It is information with attitude! As Hart reminds us, "Computer programs are not only texts: they also behave". Software is both form and substance, both symbolic and functional, it both "is" and "does". For this reason, software is conceptually very challenging.
"Computer programs are not only texts: they also behave". In other words, they
Provas
Read the text below in order to answer questions 14 to 16.
DOUBLETALK
For as long as Apple and Microsoft operating systems have lived together in the computing world, different solutions have been used to get the two platforms to communicate with each other. In this respect, two applications - Thursby Software's Dave and Miramar Systems' PC Maclan - have dominated the scene.
Nevertheless, Connectix – the makers of Virtual PC and Virtual Game Station – has now entered the fray with DoubleTalk.
DoubleTalk lets you integrate your Macintosh into a Windows network or a stand-alone PC without making any changes to the network itself. The only requirement on your part is that you connect your Mac to the PC via either a hub or crossover cable, and configure your Macintosh as part of an NT domain or workgroup.
When you install DoubleTalk, a set-up assistant runs automatically and guides you through the process of configuring the system properly. But if your plans are to connect to a company network, you will need some information provided by network administrators.
According to the author, Apple and Microsoft operating systems
Provas
Read the text below in order to answer questions 14 to 16.
DOUBLETALK
For as long as Apple and Microsoft operating systems have lived together in the computing world, different solutions have been used to get the two platforms to communicate with each other. In this respect, two applications - Thursby Software's Dave and Miramar Systems' PC Maclan - have dominated the scene.
Nevertheless, Connectix – the makers of Virtual PC and Virtual Game Station – has now entered the fray with DoubleTalk.
DoubleTalk lets you integrate your Macintosh into a Windows network or a stand-alone PC without making any changes to the network itself. The only requirement on your part is that you connect your Mac to the PC via either a hub or crossover cable, and configure your Macintosh as part of an NT domain or workgroup.
When you install DoubleTalk, a set-up assistant runs automatically and guides you through the process of configuring the system properly. But if your plans are to connect to a company network, you will need some information provided by network administrators.
According to the text, when you install DoubleTalk,
Provas
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