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仲剛 發問時間: 社會與文化語言 · 1 0 年前

請問一個統計問題..急~~~~贈20點

A sruvey was taken of 313 children, ages 14 to 22 years, from among the children of the nation's top corporate executives. When asked to identify the best aspect of being one of this privileged group, 55% montioned material and financial advantages. Suppose that the proportion p of children in the population is actually equal to 0.5. What is the probability of observing a sample proportion as large as or larger than the observed value ^P=0.55?

如題...我不是很了解應該要如何著手..麻煩高手了..謝謝...

2 個解答

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  • 阿泰
    Lv 6
    1 0 年前
    最佳解答

    請問你要翻譯? 還是要解統計題目?

    2007-04-01 23:08:36 補充:

    這各考題是要解Phat大於0.55的機率,也就是Pr(Phat>0.55)

    從題意可以知道,Phat~N(P, P*(1-P)/n)

    其中P=0.5,n=313

    故Phat~N(P, 0.5*0.5/313=0.0008)

    因此此題求

    Pr(Phat>0.55)

    =P(Z>[0.55-P]/(√P*(1-P)/n))

    =P(Z>[0.55-0.5]/(√0.5*(1-0.5)/313))

    =P(Z>1.77)

    =0.0384

    2007-04-01 23:09:31 補充:

    我想你應該是要解統計題目,而不是翻譯吧。

    參考資料: 還蠻懂統計的自己
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  • 1 0 年前

    拿313個14到22歲的年輕人來做統計,他們都是美國上層階級大工司管理階層的小孩,當他們被問到做為物質跟金錢都能夠比別的小孩更有優勢的人有何感想的時後,有55%的人同意,如果這313位佔了全部的0.5 % 請問要怎麼以這55%同意的來做全部的根據.

    參考資料: 自己
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