大学MOOC 商务统计(东北财经大学)1206460837 最新慕课完整章节测试答案
第一章 什么是统计学
文章目录
- 第一章 什么是统计学
- 第二章 Chapter 2 Describing Data Frequency Tables, Frequency Distributions, and Graphic Presentation
- 第三章 Chapter 3 Describing Data Numerical Measures
- 第四章 Chapter 4 Describing Data Displaying and Exploring Data
- 第五章 Chapter 5 A Survey of Probability Concepts
- 第六章 Chapter 6 Discrete Probability Distributions
- 第八章 Chapter 8 Sampling Methods and the Central Limit Theorem
第一单元测试
1、单选题：
The general process of gathering, organizing, summarizing, analyzing, and interpreting data to assist in making effective decisions is called:
选项：
A: statistics.
B: descriptive statistics.
C: inferential statistics.
D: levels of measurement.
答案: 【 statistics.】
2、单选题：
A sample is:
选项：
A: at least 15 observations.
B: a group of people.
C: part of a population.
D: a set of frequencies.
答案: 【 part of a population.】
3、单选题：
The main purpose of inferential statistics is to:
选项：
A: summarize data in a useful and informative manner.
B: estimate population characteristics based on a sample information.
C: determine if the data adequately represents the population.
D: gather or collect data.
答案: 【 estimate population characteristics based on a sample information.】
4、单选题：
To study the characteristics of loan applicants, a random sample of 50 loan applicants is selected and their annual incomes are obtained. Which level of measurement is annual income?
选项：
A: Nominal
B: Ordinal
C: Interval
D: Ratio
答案: 【 Ratio】
5、单选题：
The main purpose of descriptive statistics is to:
选项：
A: summarize data in a useful and informative manner.
B: estimate a population characteristic based on a sample.
C: determine if the data adequately represents the population.
D: gather or collect data.
答案: 【 summarize data in a useful and informative manner.】
6、单选题：
A bank asks customers to evaluate the quality of drive-through service as good, average, or poor. Which level of measurement is used to measure service quality?
选项：
A: Nominal
B: Ordinal
C: Interval
D: Ratio
答案: 【 Ordinal】
7、单选题：
The main purpose of descriptive statistics is to:
选项：
A: summarize data in a useful and informative manner.
B: estimate a population characteristic based on a sample.
C: determine if the data adequately represents the population.
D: gather or collect data.
答案: 【 summarize data in a useful and informative manner.】
8、单选题：
Gallup political polls ask people their political party affiliation - Democrat, Republican or Independent. Which level of measurement is used to measure party affiliation?
选项：
A: Nominal
B: Ordinal
C: Interval
D: Ratio
答案: 【 Nominal】
9、单选题：
What type of variable is: number of car accidents reported in your city?
选项：
A: Attribute
B: Continuous
C: Discrete
D: Qualitative
答案: 【 Discrete】
10、单选题：
Data measured with an ordinal scale:
选项：
A: can be ranked.
B: have a meaningful value of zero.
C: have meaningful differences between values.
D: are quantitative.
答案: 【 can be ranked.】
第二章 Chapter 2 Describing Data Frequency Tables, Frequency Distributions, and Graphic Presentation
第二单元测验
1、单选题：
In a frequency distribution the classes must:
选项：
A: be mutually exclusive.
B: have a maximum of 10 observations.
C: have equal frequencies.
D: be measured on a nominal scale.
答案: 【 be mutually exclusive.】
2、单选题：
For a frequency distribution, the class interval is:
选项：
A: the class frequencies divided by two.
B: the class frequency divided by the number of observations.
C: the difference between consecutive lower class limits.
D: the number of observations in the class.
答案: 【 the difference between consecutive lower class limits.】
3、单选题：
For a frequency distribution, a class frequency is:
选项：
A: the number of observations in the class.
B: the difference between consecutive lower class limits.
C: limited to a maximum of 10 observations.
D: the total number of observations in the sample.
答案: 【 the number of observations in the class.】
4、单选题：
A research organization is studying the selling price of laptop computers. They selected 25 different computers for the study. To summarize the selling price with a frequency distribution and using the 2k rule, how many classes would you recommend?
选项：
A: 10
B: 25
C: 4
D: 5
答案: 【 5】
5、单选题：
For a frequency distribution, the class midpoint is:
选项：
A: the class interval divided by two and added to the lower limit.
B: the difference between consecutive lower limits.
C: the number of observations in the class.
D: the class frequency divided by the number of observations.
答案: 【 the class interval divided by two and added to the lower limit.】
6、单选题：
Which of the following is not a guideline for a frequency distribution?
选项：
A: Avoid open-ended classes.
B: Use the 2k rule to determine the number of classes.
C: Make the lower limit of the first class a multiple of the class interval.
D: Each class should have more than 5 observations.
答案: 【 Each class should have more than 5 observations.】
7、单选题：
To convert a frequency distribution to a relative frequency distribution:
选项：
A: find the difference between consecutive lower class limits.
B: divide the class frequency by the total number of observations.
C: divide the lower limit of the first class by the class interval.
D: multiple the class frequency by 100.
答案: 【 divide the class frequency by the total number of observations.】
8、单选题：
A pie chart shows:
选项：
A: the frequency for each class.
B: the relative frequency for each class.
C: trends in the data.
D: the class midpoints.
答案: 【 the relative frequency for each class.】
9、单选题：
The difference between a histogram and a frequency polygon is:
选项：
A: the frequency polygon is reported as a percent, a histogram does not report percents.
B: the histogram shows frequencies while a frequency polygon shows cumulative frequencies.
C: the bars in a histogram and a frequency polygon cannot be adjacent.
D: open-ended classes can be accommodated with a frequency polygon.
答案: 【 the histogram shows frequencies while a frequency polygon shows cumulative frequencies.】
10、单选题：
In a cumulative frequency polygon:
选项：
A: the class frequencies are converted to perce