(1)當樣本數固定,若降低a,則β會______；

Part 5 (10%): Writing  You work at a notebook computer sales company, which has two subsidiaries in the South and the North. The table below shows the sales performance of the two subsidiaries in 2012~2016. The managing director has asked you to write a report on your progress. Using the information from the table, write a short objective report describing the general developments in these five years.   Write at least 150 words (on your Answer Sheet).  DO NOT USE YOUR OWN NAM(E) This is the end of the test.

 1.Sampling error can be completely eliminated by taking larger sample sizcs.(2 分)

2. In frequency distributions, classes are collectively exhaustive if each individual, object, or measurement is included in only one category. (2 分)

3. Place these variables in the following classification tables. For each table, summarize your observations and evaluate if the results are generally true. For example, salary is reporred as a continuous quantitative variable. It is also a continuous ratio-scaled variable. (8 分) a. Hair color b. Rating of a Finance Professor c. Dress size d. Number of patients seen 

(2)當固定拒絕域,要利用何種方法同時降低a及β?__________。

5. To verify that a frequency distribution for sample data is normally distributed, a_______dtatistic  is used to test the hypothesis that the sample data is normally distributed. (2 分)

6. For a two-tailed hypothesis test, the test statistic is z = 2.65. What is the p-value? (2 分) 

7.On the first statistics exam, the coefticient of determination between the hours studied and the grade earned was 80%. The standard error of estimate was 10. There were 20 students in the class. Develop an ANOVA table for the regression analysis of hours studied as a predictor of the grade carned on the first statistics exam. (8分)

a. Consider the following output. Compute the coefficient of multiple determinations, adjusted coefficient of multiple determinations and correlation coefficient. (6 分)

b. Conduct a global test of hypothesis from the preceding output. Does it appear that any of the regression coefficients are not equal to zero? (2 分)