Lajotas

Um fabricante de lajotas de cerâmica introduz um novo material em sua fabricação e acredita que aumentará a resistência média, que é de 206 kg. A resistência das lajotas tem distribuição normal com desvio padrão de 12 kg. Retira-se uma amostra de 30 lajotas, obtendo-se média de 210 kg. Ao nível de 10%, pode o fabricante aceitar que a resistência média de suas lajotas tenha aumentado?

Um fabricante de lajotas de cerâmica introduz um novo material em sua fabricação e acredita que aumentará a resistência média, que é de 206 kg. A resistência das lajotas tem distribuição normal com desvio padrão de 12 kg. Retira-se uma amostra de 30 lajotas, obtendo-se média de 210 kg. Ao nível de 10%, pode o fabricante aceitar que a resistência média de suas lajotas tenha aumentado?

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