A.a statistic

B.a parameter

C.Both A and C are correct， since they are the same

D.a population

正确答案：a statistic

6、Simon Arnett， Director of Human Resources， is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year（1；January 2005 to 31；December 2005）.Personnel records of 50 employees are selected for analysis.（The plant employs 250.） For this study， the average number days absent for these 50；employees is a（）.

A.population

B.sample

C.statistic

D.parameter

正确答案：statistic

7、Descriptive statistics deals with methods of

A.doing all of the above

B.summarising data

C.presenting data in a convenient and informative way

D.organising data.

正确答案：doing all of the above

8、Which of the following statements is not true？

A.Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data

B.One form of descriptive statistics uses numerical techniques

C.In the language of statistics， the term population refers to a group of people

D.One form of descriptive statistics uses graphical techniques

正确答案：In the language of statistics， the term population refers to a group of people

9、A student achieves an 82 on the first test in a statistics course.From this， she assumes that her average at the end of the semester（after other tests） will be about 82.This is an example of（）.

A.nonparametric statistics

B.descriptive statistics

C.inferential statistics

D.wishful thinking

正确答案：inferential statistics

10、Which of the following is not the goal of descriptive statistics？

A.Summarising data

B.Estimating characteristics of the population

C.Displaying aspects of the collected data

D.

Reporting numerical findings

正确答案：Estimating characteristics of the population

第二章单元测试

1、If data are grouped into intervals and the number of items in each group is listed， this could be called a（）.

A.frequency distribution

B.ogive

C.histogram

D.stem and leaf plot

正确答案：histogram

2、If the individual class frequency is divided by the total frequency， the result is the（）.

A.stem and leaf plot

B.relative frequency

C.midpoint frequency

D.cumulative frequency

正确答案：relative frequency

3、A cumulative frequency polygon is also called（）.