大学MOOC 统计学(西安外国语大学)1454352165 最新慕课完整章节测试答案

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: 【 a group of people.】

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.】

第二单元测验

1、单选题：
A dot plot shows:‌‌
选项：
A: the general shape of a distribution.
B: the mean, median, and mode.
C: the relationship between two variables.
D: the interquartile range.
答案: 【 the general shape of a distribution.】

2、单选题：
The test scores for a class of 101 students are computed. What is the location of the test score associated with the third quartile?‌‌
选项：
A: 75%
B: 31
C: 50.0
D: 76.5
答案: 【 76.5】

3、单选题：
‎The test scores for a class of 50 students are computed. What is the location of the test score associated with the second decile?‍
选项：
A: 20%
B: 31
C: 10.2
D: 20.5
答案: 【 10.2】

4、单选题：
​To summarize a data set with a box plot:‎
选项：
A: two values are required: the 1st quartile and the 3rd quartile.
B: three values are required: the minimum, median, and maximum.
C: four values are required: the minimum, 1st quartile, 3rd quartile, and maximum.
D: five values are required: the minimum, 1st quartile, median, 3rd quartile, and maximum.
答案: 【 five values are required: the minimum, 1st quartile, median, 3rd quartile, and maximum.】

5、单选题：
‍For a data set, the interquartile range is:‏
选项：
A: the difference between the minimum and maximum values.
B: the standard deviation.
C: the difference between the 1st and 3rd quartiles.
D: the skewness of a distribution.
答案: 【 the difference between the 1st and 3rd quartiles.】