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起止时间:2020-09-01到2021-01-16
更新状态:已完结
ch01-Introduction and data collection Exercise 1
1、 The process of using data collected from a small group to reach conclusions about a large group is called
A: statistical inference.
B: the scientific method.
C:sampling.
D:descriptive statistics.
答案: statistical inference.
2、 The estimation of the population’s average family expenditure on food based on the sample average expenditure of 1,000 families is an example of
A: inferential statistics.
B: descriptive statistics.
C: a parameter.
D:a statistic.
答案: inferential statistics.
3、 The universe or “totality of items or things” under consideration is called
A:a sample.
B: a population.
C: a parameter.
D: a statistic.
答案: a population.
4、 A summary measure that is computed to describe a characteristic of an entire population is called
A:a parameter.
B: a census.
C:a statistic.
D:the scientific method.
答案: a parameter.
5、 A population is the totality of items or things under consideration.
A:正确
B:错误
答案: 正确
6、 A sample is the portion of the universe that is selected for analysis.
A:正确
B:错误
答案: 正确
7、 The possible responses to the question “How long have you been living at your current residence?” are values from a continuous variable.
A:正确
B:错误
答案: 正确
8、 Student grades (A to F) are an example of continuous numerical data.
A:正确
B:错误
答案: 错误
ch02-Presenting data in tables and charts Exercise ch02
1、 The width of each bar in a histogram corresponds to the
A:differences between the boundaries of the class.
B: number of observations in each class.
C: midpoint of each class.
D: percentage of observations in each class.
答案: differences between the boundaries of the class.
2、 When constructing charts, the following is plotted at the class midpoints:
A: frequency histograms.
B: percentage polygons.
C: cumulative percentage polygon (ogives).
D: pie chart
答案: percentage polygons.
3、 A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below. Stem Leaves 3 2 3 4 0 3 4 7 8 9 9 9 5 0 1 1 2 3 4 5 6 1 2 5 6 6 7 0 1 8 9 2what percentage of the respondents rated overall television quality with a rating of 80 or above?
A:0
B:4
C:96
D:100
答案: 4
4、 A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below. Stem Leaves 3 2 3 4 0 3 4 7 8 9 9 9 5 0 1 1 2 3 4 5 6 1 2 5 6 6 7 0 1 8 9 2what percentage of the respondents rated overall television quality with a rating of 50 or below?
A:11
B:40
C:44
D:56
答案: 44
5、 Data on 1,500 students’ height were collected at a larger university in the East Coast. Which of the following is the best chart for presenting the information?
A: a pie chart
B:a Pareto chart
C: a side-by-side bar chart
D: a histogram
答案: a histogram
6、 In a survey, 150 executives were asked what they think is the most common mistake candidates make during job interviews. Six different mistakes were given. Which of the following is the best for presenting the information?
A: a bar chart
B: a histogram
C:a stem-and-leaf display
D:a contingency table
答案: a bar chart
7、 The sum of relative frequencies in a distribution always equals 1.
A:正确
B:错误
答案: 正确
8、 The sum of cumulative frequencies in a distribution always equals 1.
A:正确
B:错误
答案: 错误
9、 One of the advantages of a pie chart is that it clearly shows that the total of all the categories of the pie adds to 100%.
A:正确
B:错误
答案: 正确
10、 The original data values cannot be determined once they are grouped into a frequency distribution table.
A:正确
B:错误
答案: 正确
11、 The stem-and-leaf display is often superior to the frequency distribution in that it maintains the original values for further analysis.
A:正确
B:错误
答案: 正确
12、 The relative frequency is the frequency in each class divided by the total number of observations.
A:正确
B:错误
答案: 正确
ch03- Numerical descriptive measures Exercise 3
1、 Which of the following statistics is NOT a measure of central tendency?
A:arithmetic mean
B:median
C: mode
D: Q3
答案: Q3
2、 Which measure of central tendency can be used for both numerical and categorical variables?
A: arithmetic mean
B: median
C:mode
D: standard deviation
答案: mode
3、 Which of the arithmetic mean, median, and mode are resistant measures of central tendency?
A:the arithmetic only
B:the median only
C: the mode mean only
D:the median and mode only
答案: the median and mode only
4、 In a right-skewed distribution,
A: the median equals the arithmetic mean.
B: the median is less than the arithmetic mean.
C: the median is greater than the arithmetic mean.
D:none of the above
答案: the median is less than the arithmetic mean.
5、 When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate?
A: CV and range
B: arithmetic mean and standard deviation
C: interquartile range and median
D:variance and interquartile range
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