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TOEIC・英語 大学生・専門学校生・社会人

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15 語数: 398 語 出題校 法政大 5 We are already aware that our every move online is tracked and analyzed. But you 2-53 couldn't have known how much Facebook can learn about you from the smallest of social interactions - a 'like'*. (1) Researchers from the University of Cambridge designed (2) a simple machine-learning 2-54 system to predict Facebook users' personal information based solely on which pages they had liked. E "We were completely surprised by the accuracy of the predictions," says Michael 2-55 Kosinski, lead researcher of the project. Kosinski and colleagues built the system by scanning likes for a sample of 58,000 volunteers, and matching them up with other 10 profile details such as age, gender, and relationship status. They also matched up those likes with the results of personality and intelligence tests the volunteers had taken. The team then used their model to make predictions about other volunteers, based solely on their likes. The system can distinguish between the profiles of black and white Facebook users, 15 getting it right 95 percent of the time. It was also 90 percent accurate in separating males and females, Democrats and Republicans. Personality traits like openness and intelligence were also estimated based on likes, and were as accurate in some areas as a standard personality test designed for the task. Mixing what a user likes with many kinds of other data from their real-life activities could improve these predictions even more. 20 Voting records, utility bills and marriage records are already being added to Facebook's database, where they are easier to analyze. Facebook recently partnered with offline data companies, which all collect this kind of information. This move will allow even deeper insights into the behavior of the web users. 25 30 (3) - Sarah Downey, a lawyer and analyst with a privacy technology company, foresees insurers using the information gained by Facebook to help them identify risky customers, and perhaps charge them with higher fees. But there are potential benefits for users, too. Kosinski suggests that Facebook could end up as an online locker for your personal information, releasing your profiles at your command to help you with career planning. Downey says the research is the first solid example of the kinds of insights that can be made through Facebook. "This study is a great example of how the little things you do online show so much about you,” she says. "You might not remember liking things, " but Facebook remembers and (4) it all adds up.", * a 'like': フェイスブック上で個人の好みを表示する機能。 日本語版のフェイスブックでは「いいね!」 と表記される。 2-56 2-57 2-58 36

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数学 大学生・専門学校生・社会人

統計学の質問です。 問題は1番上のものです。 周辺密度関数、X,Y,XYの平均を求めるときの積分範囲はどうすれば良いのでしょうか。 0<x,y<∞など単純なものであれば何も気にせず積分すればよかったのですが今回のように 0≦x≦y<∞(y=xより上側かつxは0以上の領域)... 続きを読む

4.10 確率変数 X, Y が独立であるとき,次の確率を求めよ。 (1) X, Y が同じ幾何分布に従うとき, P(Y> X). の点の座標をそれぞれ Y,Zとする.そのとき, 線分 QR の長さ L=1. 区間 [0, X] と区間 [X,1] からそれぞれにランダムに1点ずつ Q, Rをとりえ 1. 確率変数と確率分布 64 4.6 確率変数 X, Y の同時密度関数は 1 (x.y) = xp-- 0<z<y<。 f(x, y) = であるとする、ここでa,Bは, a, B > 0, a+ β なる定数である。 (1) X,Y の周辺密度関数 (z). f(y)を求めよ。 (2) X=xを与えたときの Yの条件付き密度関数 fa(ylz) を求めょ (3) X, Y の平均,分散はいくらか. Xと Yの相関係数はいくらか 4.7 XとYは独立な確率変数であって, それぞれ母数が p, q (0 < p,q< 幾何分布 G(), G(q)に従うとする。 このとき, Z= min(X, Y) はどん。 に従うか、また, 平均 E(Z) と分散 V(Z) を求めよ. 肩 4.8 区間 [0, 1]からランダムに1点をとりその点の座標をXとする。次に,1 [X,1] からランダムに1点をとりその点の座標を Yとする, このとき,(1 = の同時分布を求めよ. それぞれの平均と分散,また,X, Y の相関係数を よ。 A9 区間[0.1] からランダムに1点Pをとりその点の座標をXとする。 区間[0.X] と区間 [X,1] からそれぞれにランダムに1点ずつ Q.Rをとりを の平均,分散を求めよ。 .4.11 確率変数 X Yは同じ平む

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数学 大学生・専門学校生・社会人

2次元確率分布の期待値について 画像のように期待値は定義されています。 これから離散の場合だと E[X]=Σ[j=1 to r]xj•P(x=xj)と求めることができます。 しかし E[Y]=Σ[k=1 to c]yk•P(Y=yk)を上みたいに簡単に求めることはできない... 続きを読む

(x,9) = f(x)fa(y). X X, Y:独立 Y =yを与えたときのXの条件付き密度関数は f(z,y) f(x, v) h (zl) = *o nal . (z,y) de 18 で定義される。この条件付き密度関数による平均, 分散が Y = yを与えた こ、 ときのXの条件付き平均, 分散である: *00 E[Xy] = E[X|Y=y]= |zf(zl) da , ional VIXl] = V[X|Y=v]= _(x-E[X\v]}"A(zl») dx. 18 午 また、X=ェを与えたときの Yの条件付き密度関数,平均,分散も同様 a である。 4.2 共分散と相関係数 (X, Y) の関数 h(X, Y) の平均は, 確率変数の平均と同様に O X E((X, Y)} = |/ Me,y) dF(x,1) ときで定義され,離散分布と密度型分布に対しては次のように計算される: r E{h(X, Y)} = 2と(x;, Ya)f(x;, Uk) (離散) j=1 k=1 E(h(X, Y)} = | T Ma,y)f(x,v) drdy (密度)。 前述の(E1) - (E4) (19 ページ) と同様な性質に加え,さらに,次の性質が成 り立つ: (E5)関数が直積のときは, 条件付き平均を使って,ー E(h(X)h(Y)} = E(E[h(X)|Y]h(Y)). (E6) X, Y が独立のとき, 関数の積の平均は平均の積に等しい: E(h(X)h(Y)} = E{h(X)}E{ha(Y).

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TOEIC・英語 大学生・専門学校生・社会人

70の問題の回答がなぜDになるのかが分かりません。 因みにTOEICのリスニング問題のPart3です。

68. Who is the man? M It's such a pleasure to finally meet you, Olivia. As coordinator of this year's international trade conference, thank you for Transportation modes and how they can affect your supply chain"(B) An event coordinator accepting our invitation to lead one of our sessions. Saturday, November 19 10:00 am - 12:00 pm (A) An expert in international trade Sponsored by Dupree Logistics - Drew Flint, Senior Partner (C) A trade representative (D) An owner of an agency Room 101 W The pleasure is mine, Ruben. Our agency is always happy to have representatives 12:00 Noon - 1:15 pm 69. What has the woman agreed to do? (A) Lead a conference session (B) Conduct an interview (C) Schedule an appointment (D) Accept a new position Lunch participate in your conference. Witon Hotel - Wolfgang Puck's Spoon M As requested by your assistant, Jamie, your session has been scheduled for the afternoon of November 19. Ilf you check the schedule, you will see the title of your presentation listed in the last time slot on that day. 1:30 am - 3:00 pm 「Asia: A strategic approach to effectively developing and executing your Asian marketing plan" Sponsored by Blackbox Associates - Olivia Ingersol, Chief 70. Look at the graphic, Who does the woman Operating Officer Room 102 work for? 3:15 pm - 4:00 pm Closing Ceremony Wisconsin Center Ballroom (A) DuPree Logistics (B) The Witon Hotel (C) Wolfgang Puck's Spoon (D) Blackbox Assodiates W Thank you very much, and I'l see you at the conference.

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