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Suatu pabrik roti memiliki standar produksi 90% produksinya adalah baik (10% rusak). Suatu hari kepala bagian produksi memperoleh data bahwa kerusakan hari itu adalah 12%

Suatu pabrik roti memiliki standar produksi 90% produksinya adalah baik (10% rusak). Suatu hari kepala bagian produksi memperoleh data bahwa kerusakan hari itu adalah 12% yang diperoleh dari sampel sebesar 100 produk. Ujilah, apakah hal ini bersifat random (acak) ataubenar-benar kerusakan tersebut bersifat permanen (= perlu perbaikan mesin)!

(petunjuk : gunakan = 5%).

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