2024知到答案 商务统计 最新智慧树满分章节测试答案
绪论 单元测试
文章目录
1、单选题：
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:descriptive statistics
B:nominal data
C:nonparametric statistics
D:inferential statistics
答案: 【descriptive statistics】
第一章 单元测试
1、单选题：
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:population
B:parameter
C:statistic
D:sample
答案: 【population】
2、单选题：
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:parameter
C:statistic
D:population
答案: 【sample】
3、单选题：
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:46.4% of, or 2320, voters interviewed who plan not to vote for him
C:53.6 % of, or 2680, voters interviewed who plan to vote for him
D:5000 registered voters interviewed.
答案: 【3 million registered voters in the state.】
4、单选题：
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1January 2005 to 31December 2005). The average number of absences per employee, calculated from the personnel data of all employees, is a ___________________.
选项：
A:population
B:statistic
C:parameter
D:sample
答案: 【parameter】
5、单选题：
A summary measure that is computed from a sample to describe a characteristic of the population is called
选项：
A:a statistic
B:Both A and C are correct, since they are the same
C:a population
D:a parameter
答案: 【a statistic】
6、单选题：
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1January 2005 to 31December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50employees is a ________________.
选项：
A:parameter
B:sample
C:population
D:statistic
答案: 【statistic】
7、单选题：
Descriptive statistics deals with methods of
选项：
A:presenting data in a convenient and informative way
B:summarising data
C:organising data.
D:doing all of the above
答案: 【doing all of the above】
8、单选题：
Which of the following statements is not true?
选项：
A:One form of descriptive statistics uses graphical techniques
B:Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data
C:In the language of statistics, the term population refers to a group of people
D:One form of descriptive statistics uses numerical techniques
答案: 【In the language of statistics, the term population refers to a group of people】
9、单选题：
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:wishful thinking
B:nonparametric statistics
C:inferential statistics
D:descriptive statistics
答案: 【inferential statistics】
10、单选题：
Which of the following is not the goal of descriptive statistics?
选项：
A:Reporting numerical findings
B:Summarising data
C:Estimating characteristics of the population
D:Displaying aspects of the collected data
答案: 【Estimating characteristics of the population】
第二章 单元测试
1、单选题：
If data are grouped into intervals and the number of items in each group is listed, this could be called a _______________.
选项：
A:ogive
B:histogram
C:frequency distribution
D:stem and leaf plot
答案: 【histogram】
2、单选题：
If the individual class frequency is divided by the total frequency, the result is the __________.
选项：
A:stem and leaf plot
B:midpoint frequency
C:relative frequency
D:cumulative frequency
答案: 【relative frequency】
3、单选题：
A cumulative frequency polygon is also called _______________.
选项：
A:a histogram
B:an ogive
C:a stem and leaf plot
D:a frequency polygon
答案: 【an ogive】
4、单选题：
The number of class intervals in a frequency distribution is usually between ___________.
选项：
A:7 and 9
B:3 and 5
C:5 and 15
D:1 and 25
答案: 【5 and 15】
5、单选题：
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:the class midpoints are used as the stem
D:it contains more class intervals
答案: 【the values of the original data are retained】
6、单选题：
One rule that must always be followed in constructing frequency distributions is that ________.
选项：
A:the number of classes must be less than 10
B:each data point can only fall into one class
C:the width of each class is equal to the range
D:the number of intervals must be an odd number
答案: 【each data point can only fall into one class】
7、单选题：
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:ogive
C:histogram
D:pie chart
答案: 【pie chart】
8、单选题：
A cumulative frequency distribution would provide _____________.
选项：
A:a very cloudy picture of the frequencies
B:the proportion of the total frequencies which fall into each class
C:a graph of a frequency distribution
D:a running total of the frequencies in the classes
答案: 【a running total of the frequencies in the classes】
9、单选题：
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.Class IntervalFrequency20-under 403040-under 604560-under 808080-under 10045What is the cumulative frequency of the third class?
选项：
A:155
B:80
C:75
D:0.40
答案: 【155】
10、单选题：
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.Class IntervalFrequency20-under 403040-under 604560-under 808080-under 10045What is the approximate range of the number of phone calls arriving each hour?
选项：
A:80
B:100
C:200
D:20
答案: 【80】