10级商统考试试题回顾学术千万不要被人知道是我写的

1、10 级商统学术试题回顾！期中：老师1.一模一样 The following table shows two sles of the firm in production.a.b.c.d.Compute the mean.Compute the variance and standard deviation. Compute the coefficient of standard deviation. Compare with firm A and firm B.2.一模一样（15%）A study is being made of annual results are:es oculty i

2、n higher education. TheAt =0.05 level, determine if the annuales oculty in se universities aresignificantly greatern those in private universities.备注：老师说 2 个总体的样本均值不考，但最后还是考了。原题。3. 类似，不完全一样。会做这题就会做 10 级那道题的了。（15%）Training time in days for the computer-assisted training program at Scheer Industries a

3、s following table.a.What is the poestimate of the population mean of the training time;b. What is the 95% confidenceerval for the population mean of the training time;c.What is the 95% confidenceerval for the population when the time is large30 days.n4.一模一样（15%）Mary isanizing a spel outdoors show wh

4、ich will take place on August 15.The earnings from the show will depend heavily on the weather. If it rains on August 15, the showDaysEmployees30405Se UniversityPrivate Universityn150100 x4521345153s21890013000Output personMember ofs in firm AMember ofs in firm B200-3002030300-400150120400-500304050

5、0-600010Total200200will lose $20,000; if it inny on August 15, the show will earn $15,000. Historically, thelikelihood of it raining on any given dayhas the option of canceling the show byid-August is 27%. Supet today is July 31. Maryof the day on July 31, but if she does so, she willthen lose $1,00

6、0 deit on the facilities.a) What is Marys optimal decistrategy?b) Give sensitivityysis of the optimal deci.期末：新老师。完全作业原题，10 级的和以前的基本一样，所以估计11 级也是这 4 道题（不能一定保证）。但是是作业题是会改一点数据！。但要注意看，Note: Please answer the four questions below in English,nk you! Wish you sucs!（这段话去年的卷子上写在开头的.所以要记得用英文答题）1. An automoti

7、ve part must be machined to close to toleranto be acceptable tocustomers. Production specifications call for aum variancehe lengths of the partse the sle variance for 30 parts turns out to be s2=.0005. Using=.05, test toof .0004. Supsee whether the population varianpecification is being violated.备注：

8、10 级把数据把 variance 从 0.0004 改成 0.0005，s2=.0005 改成 0.00042. One of the questions on the Businessk Subscriber Study says, “he past 12 months,when traveling for business, what type of airline ticket did you purchase most often?” The dataobtained are shownhe following contingency table.Type of flightType

9、 of ticketclass Business/executive class Full fare economy/coachclassDomestic Flights3090500ernational Flights20120130Using =.05 and test for the independence of type of flight and type of ticket. What is your?3.英文书 p337 第一题。但貌似 a 换成了 0.10，要看清楚题目。4. Given are five observations for two variables, x a

10、nd y.Table1.Xi yiThe data of five observations for two variables, x and y132735411514a. Estimate the standard deviation ofyp when x=4.b. Develop a 95% confidenceerval for the expected value of y when x=4.Estimate the standard deviation of an individual value of y when x=4.Develop a 95% predictionerval for y when x=4.Does the t test indicate a significant relationship betn x and y? What is your? Use =.05.? Use =.05.f. Test fo