試解釋下列名詞:
(1) 顯著水準(level of significance)
(2) 最強力檢定(most of significance)
一天內發生之電話撥號數服從母數為λ 之波氏分配。且各撥號為互相獨立,其通
話之長度服從母數為μ 之指數分配,試求一天內通話時間合計之p.d.f.。
某種機器之壽命服從指數分配時,試作其平均壽命μ = μ0 之檢定方式。
The lifetime of a printer costing 200 is exponentially distributed with mean 2 years.
The manufacturer agrees to pay a full refund to a buyer if the printer fails during the
first year following its purchase, and a one-half refund if it fails during the second year.
If the manufacturer sells 100 printers, how much should it expect to pay in refunds?
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