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：
​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 comp