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suatu produsen busi mengklaim bahwa businya memiliki masa pakai rata rata lebih dari 22.100ml. Anggaplah umur busi tersebut mengikuti distribusi normal. seorang pemilik armada membeli

suatu produsen busi mengklaim bahwa businya memiliki masa pakai rata rata lebih dari 22.100ml. Anggaplah umur busi tersebut mengikuti distribusi normal. seorang pemilik armada membeli sejumlah besar busi tersebut. sampel sebanyak 25 unit mengungkapkan bahwa masa pakai rata rata nya adalah 23.400ml dan standar deviasi nya 2.000ml klaim produsen tersebut pada tingkat signifikan 0.05

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