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Suatu pabrik menyatakan bahwa cata-rata daya rentang benang A melebihi daya rentang benang B paling sedikit 12 kg. Untuk menuji pernyataan ini SO potong

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Suatu pabrik menyatakan bahwa cata-rata daya rentang benang A melebihi daya rentang benang B paling sedikit 12 kg. Untuk menuji pernyataan ini SO potong benang dari tiap jenis diuji dalam keadaan sama_ Benang A mempunyai cata-rata daya rentang 86,7 kg dengan simpangan baku 6,28 Ig, sedangkan benang B mempunyai rata-rata daya rentang 77,8 kg denan simpangan baku 5,61 kg. Ujilah pernyataan tadi denan taraf 0,05 dan anggap bahwa kedua populasi berdistribusi hampir normal dengan variansi sama_

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