本答案对应课程为:点击查看
本课程起止时间为:2021-03-03到2021-06-30
本篇答案更新状态:已完结
第一章 什么是统计学 第一单元测试
1、 问题: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、 问题: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.】
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、 问题: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、 问题: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、 问题: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、 问题: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、 问题: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、 问题: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、 问题: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
1、 问题: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、 问题: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、 问题:For a frequency distribution， a class frequency is:
选项：
A:the number of observations in the class.
