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Uma amostra aleatória de 250 residências de famílias, classe média com dois filhos, revelou a seguinte distribuição do consumo mensal de energia elétrica:

Pede-se: O consumo médio por residência:

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Questionário

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Consulta a anuários e revistas

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Entrevistas por telefone

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Entrevistas pessoais

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Observação

","Questionários, entrevistas (por telefone ou presenciais) e observação produzem dados obtidos diretamente da fonte, caracterizando-se como coleta de dados primários. Já a consulta a anuários e revistas recorre a documentos previamente publicados, portanto utiliza dados secundários. Assim, essa é a única opção que não representa método de coleta de dados primários.","

Há diversos métodos para coletar dados primários citados, abaixo, exceto:

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A série estatística representada é:

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Comentários