感謝星潔的提醒,雖然我沒能比對兩個版本課本的差異 不過看樣子新版的第四題好像是沒有數據的,題目似乎也不同 我把舊版第四題(及相關的第二題)的題目key在下面~請大家參考 請注意alpha, beta, estimate(就是頭上那頂帽子)是我用來代替原本符號的作法 另外一些用英文不大能表達的我會改用中文,請大家見諒 Ex.4 Just as you are about to estimate a regression (due tomorrow), massive sunspots cause magnetic interference that ruins all electricity powered machines (e.g., computers). Instead of giving up and flunking, you decide to calculate estima- tes from your data (on per capita income in thousands of US dollars as a funct- ion of the percent of the labor force in agriculture in 10 developed countries) using methods like those used in Section 2.1.3 without a computer. Your data are: Country A B C D E F G H I J ------------------------------------------------------------------------- Income 6 8 8 7 7 12 9 8 9 10 % on farms 9 10 8 7 10 4 5 5 6 7 a. Calculate the estimate of beta 0 and the estimate of beta 1. b. Calculate R平方及調整後的R平方(R bar 平方) c. If the percentage of the labor force in agriculture in another developed country was 8 percent, what level of per capita income (in thousands of US dollars) would you guess that country had? Ex. 2 To get more practice of summation notation, use the data in Exercise 4 on Inco- me (Y) and Percent of the labor force on farms (X) to anser the following ques- tions. a. 計算X總和 b. 計算Y總和 c. 計算3X的總和,它和X總和的三倍相等嗎? d. 計算X+Y的總合,它和X的總和+Y的總和相等嗎? 另外,有興趣使用SAS的同學真的可以上計中軟體銀行(www.cc.ntu.edu.tw)下載 學習版 以上,祝大家做作業順利 昀昇上 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.166.109.216