2024知到答案 商务统计冬学期 完整智慧树网课章节测试答案

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:

sample

C:

parameter

D:

statistic

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:population

B:statistic

C:sample

D:parameter

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:53.6 % of, or 2680, voters interviewed who plan to vote for him

B:5000 registered voters interviewed.

C:46.4% of, or 2320, voters interviewed who plan not to vote for him

D:3 million registered voters in the state.

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 (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:sample

B:population

C:statistic

D:parameter

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 parameter

B:a population

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

D:a statistic

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 (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:population

B:statistic

C:sample

D:parameter

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:doing all of the above

D:organising data.

答案: 【doing all of the above
】

8、单选题：
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 graphical techniques

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:nonparametric statistics

B:wishful thinking

C:descriptive statistics

D:inferential 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:Displaying aspects of the collected data

C:Estimating characteristics of the population

D:Summarising 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:histogram

B:ogive

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:midpoint frequency

B:stem and leaf plot

C:

cumulative frequency

D:relative frequency

答案: 【relative frequency
】

3、单选题：
A cumulative frequency polygon is also called _______________.
选项：
A:a frequency polygon

B:a stem and leaf plot

C:an ogive

D:a histogram

答案: 【an ogive
】

4、单选题：
The number of class intervals in a frequency distribution is usually between ___________.
选项：
A:5 and 15

B:3 and 5

C:1 and 25

D:7 and 9

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:it contains more class intervals

C:the values of the original data are retained

D:

the class midpoints are used as the stem

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 intervals must be an odd number

B:the number of classes must be less than 10

C:the width of each class is equal to the range

D:

each data point can only fall into one class

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:histogram

B:pie chart

C:ogive

D:stem and leaf chart

答案: 【pie chart
】

8、单选题：
A cumulative frequency distribution would provide _____________.
选项：
A:a graph of a frequency distribution

B:the proportion of the total frequencies which fall into each class

C:a running total of the frequencies in the classes

D:a very cloudy picture of the frequencies

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 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:0.40

B:75

C:80

D:155

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 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:100
B:200
C:80
D:20
答案: 【80】