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Pt jaya memiliki karyawan sebanyak 800 orang untuk keperluan tertentu ingin diketahui rata rata lama jam kerja karyawan dalam satu minggu. Untuk keperluan tersebut diambil

Pt jaya memiliki karyawan sebanyak 800 orang untuk keperluan tertentu ingin diketahui rata rata lama jam kerja karyawan dalam satu minggu. Untuk keperluan tersebut diambil sampel secara acak 100 orang dengan rata rata jam kerjanya 85. Jika simpangan baku rata rata 2,05. Dugalah rata rata jam kerja karyawan dengan tingkat keyakinan 95%.

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