2024智慧树网课答案 商务统计冬学期 最新完整智慧树知到满分章节测试答案

绪论 单元测试

1、 问题:

Penny Bauer, Chief Financial Officer of Harrison Haulage, suspects irregularities in the payroll system, and orders an inspection of ‘each and every payroll voucher issued since 1 January 2005’. Five per cent of the payroll vouchers contained material errors. This is an example of ____.

选项：
A:inferential statistics
B:nonparametric statistics
C:nominal data
D:descriptive statistics
答案: 【descriptive statistics】

第一章 单元测试

1、 问题:

Michael Bayley, Marketing Director of UniPower’s Electrical Division, is leading a study to identify and assess the relative importance of product features. Michael directs his staff to design a survey questionnaire for distribution to all of UniPower’s 954 customers. For this study, the set of 954 customers is a ____.

选项：
A:

parameter

B:

statistic

C:

sample

D:population
答案: 【population
】

2、 问题:

Claudia Taylor, Director of Global Industrial Sales in Melbourne, is concerned by a deteriorating sales trend. Specifically, the number of customers is stable at 1500 but they are purchasing less each year. She orders her staff to search for causes of the downward trend by selecting a focus group of 40 industrial customers. For this study, the set of 40 industrial customers is a _.

选项：
A:sample
B:population
C:parameter
D:statistic
答案: 【sample
】

3、 问题:

A politician who is running for the office of premier in a state with 3 million registered voters commissions a survey. In the survey, 53.6% of the 5000 registered voters interviewed say they plan to vote for him. The population of interest is the

选项：
A:3 million registered voters in the state.
B:53.6 % of, or 2680, voters interviewed who plan to vote for him
C:46.4% of, or 2320, voters interviewed who plan not to vote for him
D:5000 registered voters interviewed.
答案: 【3 million registered voters in the state.
】

4、 问题:

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). The average number of absences per employee, calculated from the personnel data of all employees, is a _______.

选项：
A:statistic
B:sample
C:parameter
D:population
答案: 【parameter
】

5、 问题:

A summary measure that is computed from a sample to describe a characteristic of the population is called

选项：
A:a parameter
B:Both A and C are correct, since they are the same
C:a population
D:a statistic
答案: 【a statistic
】

6、 问题:

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 ____.

选项：
A:sample
B:statistic
C:parameter
D:population
答案: 【statistic
】

7、 问题:

Descriptive statistics deals with methods of

选项：
A:summarising data
B:presenting data in a convenient and informative way
C:organising data.
D:doing all of the above
答案: 【doing all of the above
】

8、 问题:

Which of the following statements is not true?

选项：
A:Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data
B:In the language of statistics, the term population refers to a group of people
C:One form of descriptive statistics uses numerical techniques
D:One form of descriptive statistics uses graphical techniques
答案: 【In the language of statistics, the term population refers to a group of people
】

9、 问题:

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 _______.

选项：
A:nonparametric statistics
B:descriptive statistics
C:inferential statistics
D:wishful thinking
答案: 【inferential statistics
】

10、 问题:

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

选项：
A:

Reporting numerical findings

B:Estimating characteristics of the population
C:Displaying aspects of the collected data
D:Summarising data
答案: 【Estimating characteristics of the population
】

第二章 单元测试

1、 问题:

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

选项：
A:frequency distribution
B:histogram
C:stem and leaf plot
D:ogive
答案: 【histogram
】

2、 问题:

If the individual class frequency is divided by the total frequency, the result is the ____.

选项：
A:midpoint frequency
B:stem and leaf plot
C:relative frequency
D:

cumulative frequency

答案: 【relative frequency
】

3、 问题:

A cumulative frequency polygon is also called ___.

选项：
A:a histogram
B:a stem and leaf plot
C:an ogive
D:a frequency polygon
答案: 【an ogive
】

4、 问题:

The number of class intervals in a frequency distribution is usually between _____.

选项：
A:3 and 5
B:7 and 9
C:1 and 25
D:5 and 15
答案: 【5 and 15
】

5、 问题:

One advantage of a stem and leaf plot over a frequency distribution is that ____.

选项：
A:the class midpoints are used as the leaf
B:the values of the original data are retained
C:it contains more class intervals
D:

the class midpoints are used as the stem

答案: 【the values of the original data are retained
】

6、 问题:

One rule that must always be followed in constructing frequency distributions is that __.

选项：
A:

each data point can only fall into one class

B:the width of each class is equal to the range
C:the number of classes must be less than 10
D:the number of intervals must be an odd number
答案: 【

each data point can only fall into one class

】

7、 问题:

Which of the following is best to show the percentage of a total budget that is spent on each category of items?

选项：
A:stem and leaf chart
B:histogram
C:ogive
D:pie chart
答案: 【pie chart
】

8、 问题:

A cumulative frequency distribution would provide _______.

选项：
A:the proportion of the total frequencies which fall into each class
B:a graph of a frequency distribution
C:a very cloudy picture of the frequencies
D:a running total of the frequencies in the classes
答案: 【a running total of the frequencies in the classes
】

9、 问题:

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.

Class Interval	Frequency
20-under 40	30
40-under 60	45
60-under 80	80
80-under 100	45

What is the cumulative frequency of the third class?

选项：
A:75
B:155
C:80
D:0.40
答案: 【155
】

10、 问题:

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.

Class Interval	Frequency
20-under 40	30
40-under 60	45
60-under 80	80
80-under 100	45

What is the approximate range of the number of phone calls arriving each hour?

选项：
A:20
B:100
C:200
D:80
答案: 【80】

第三章 单元测试

1、 问题:

Simon Arnett, Director of Human Resources, is exploring employee absenteeism at the Buderim Bottling during the last operating year. A sample of six personnel records produced the following data: 0, 2, 4, 7, 2, 9. The variance of the number absences per employee is ______.

选项：
A:9.67
B:3.11
C:11.6
D:3.41
答案: 【11.6】