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Satu sampel rawak yang bersaiz 15 telah diambil daripada populasi yang bertaburan normal. Sampel berkenaan mencatatkan min dan varian, masing-masing bersamaan 75 dan 25.

Satu sampel rawak yang bersaiz 15 telah diambil daripada populasi yang bertaburan normal. Sampel berkenaan mencatatkan min dan varian, masing-masing bersamaan 75 dan 25. Aras keyakinan ialah 95%. Dapatkan: Nilai kritikal bagi statistik ujian : Nilai had atas (upper limit) bagi anggaran selang populasi:

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